diff --git a/frontend/i18n/locales/fr.json b/frontend/i18n/locales/fr.json
index 85d206e..4db541f 100644
--- a/frontend/i18n/locales/fr.json
+++ b/frontend/i18n/locales/fr.json
@@ -390,9 +390,34 @@
             },
             "tab": {
                 "contact": "Contact",
+                "contacts": "Contacts",
                 "address": "Adresse",
+                "reports": "Rapports",
+                "exchanges": "Échanges",
                 "accounting": "Comptabilité"
             },
+            "action": {
+                "edit": "Modifier",
+                "archive": "Archiver",
+                "restore": "Restaurer"
+            },
+            "consultation": {
+                "title": "Fiche prestataire",
+                "back": "Retour au répertoire",
+                "loading": "Chargement…",
+                "notFound": "Prestataire introuvable.",
+                "emptyContacts": "Aucun contact.",
+                "emptyAddresses": "Aucune adresse.",
+                "confirmArchive": "Archiver ce prestataire ? Il n'apparaîtra plus dans le répertoire actif.",
+                "confirmRestore": "Restaurer ce prestataire ? Il réapparaîtra dans le répertoire actif."
+            },
+            "edit": {
+                "title": "Modifier le prestataire",
+                "back": "Retour à la fiche",
+                "loading": "Chargement…",
+                "notFound": "Prestataire introuvable.",
+                "save": "Enregistrer"
+            },
             "form": {
                 "title": "Ajouter un prestataire",
                 "back": "Précédent",
@@ -459,7 +484,9 @@
                 "error": "Une erreur est survenue. Réessayez.",
                 "exportError": "L'export du répertoire prestataires a échoué. Réessayez.",
                 "createSuccess": "Prestataire créé avec succès",
-                "updateSuccess": "Prestataire mis à jour avec succès"
+                "updateSuccess": "Prestataire mis à jour avec succès",
+                "archiveSuccess": "Prestataire archivé avec succès",
+                "restoreSuccess": "Prestataire restauré avec succès"
             }
         }
     },
diff --git a/frontend/modules/technique/composables/__tests__/useProviderForm.test.ts b/frontend/modules/technique/composables/__tests__/useProviderForm.test.ts
index a4a7c4f..97c3514 100644
--- a/frontend/modules/technique/composables/__tests__/useProviderForm.test.ts
+++ b/frontend/modules/technique/composables/__tests__/useProviderForm.test.ts
@@ -585,3 +585,70 @@ describe('useProviderForm — onglet Comptabilite (ERP-144)', () => {
         expect(mockPatch).not.toHaveBeenCalled()
     })
 })
+
+describe('useProviderForm — modification (ERP-145)', () => {
+    beforeEach(() => {
+        mockPost.mockReset()
+        mockPatch.mockReset()
+        permState.accountingView = false
+        permState.accountingManage = false
+    })
+
+    it('editMode : completeTab ne verrouille pas et ne bascule pas d\'onglet', () => {
+        const form = useProviderForm()
+        form.editMode.value = true
+        form.activeTab.value = 'contact'
+
+        expect(form.completeTab('contact')).toBe(false)
+        expect(form.isValidated('contact')).toBe(false)
+        expect(form.activeTab.value).toBe('contact')
+    })
+
+    it('updateMain : PATCH /providers/{id} sur le groupe principal (pas de POST)', async () => {
+        mockPatch.mockResolvedValueOnce({ id: 7, companyName: 'MAINTENANCE PRO' })
+        const form = useProviderForm()
+        form.providerId.value = 7
+        form.main.companyName = 'Maintenance Pro'
+        form.main.categoryIris = [CAT_MAINT]
+        form.main.siteIris = [SITE_86]
+
+        const ok = await form.updateMain()
+
+        expect(ok).toBe(true)
+        expect(mockPost).not.toHaveBeenCalled()
+        expect(mockPatch).toHaveBeenCalledWith(
+            '/providers/7',
+            { companyName: 'Maintenance Pro', categories: [CAT_MAINT], sites: [SITE_86] },
+            { toast: false },
+        )
+        // Reaffiche le nom normalise renvoye par le serveur.
+        expect(form.main.companyName).toBe('MAINTENANCE PRO')
+    })
+
+    it('updateMain : RG-3.03 front -> bloque le PATCH sans site', async () => {
+        const form = useProviderForm()
+        form.providerId.value = 7
+        form.main.companyName = 'X'
+        form.main.categoryIris = [CAT_MAINT]
+
+        const ok = await form.updateMain()
+
+        expect(ok).toBe(false)
+        expect(mockPatch).not.toHaveBeenCalled()
+        expect(form.mainErrors.errors.sites).toBe('technique.providers.form.errors.siteRequired')
+    })
+
+    it('updateMain : 409 doublon -> erreur inline sur companyName', async () => {
+        mockPatch.mockRejectedValueOnce({ response: { status: 409 } })
+        const form = useProviderForm()
+        form.providerId.value = 7
+        form.main.companyName = 'Doublon'
+        form.main.categoryIris = [CAT_MAINT]
+        form.main.siteIris = [SITE_86]
+
+        const ok = await form.updateMain()
+
+        expect(ok).toBe(false)
+        expect(form.mainErrors.errors.companyName).toBe('technique.providers.form.duplicateCompany')
+    })
+})
diff --git a/frontend/modules/technique/composables/useProvider.ts b/frontend/modules/technique/composables/useProvider.ts
new file mode 100644
index 0000000..db795e2
--- /dev/null
+++ b/frontend/modules/technique/composables/useProvider.ts
@@ -0,0 +1,70 @@
+import { ref } from 'vue'
+import type { ProviderDetail } from '~/modules/technique/utils/forms/providerDetail'
+
+/**
+ * Chargement et actions d'archivage d'un prestataire unique (ecrans Consultation /
+ * Modification, ERP-145). Miroir de `useSupplier` (M2). Lit le detail embarque via
+ * `GET /api/providers/{id}` (contacts / adresses + leurs sous-collections / ribs
+ * sous `provider:item:read` / `provider:read:accounting`) — une SEULE requete
+ * peuple les deux ecrans (embed borne, pas de N+1).
+ *
+ * L'en-tete `Accept: application/ld+json` est impose pour obtenir le payload Hydra
+ * complet (avec les `@id` des relations embarquees, indispensables au pre-remplissage).
+ *
+ * Etat 100 % local a l'instance (refs). Les erreurs d'archivage / restauration
+ * (notamment le 409 d'homonyme actif a la restauration) sont PROPAGEES a l'appelant,
+ * qui decide du toast a afficher.
+ */
+export function useProvider(id: number | string) {
+    const api = useApi()
+
+    const provider = ref<ProviderDetail | null>(null)
+    const loading = ref(false)
+    const error = ref(false)
+
+    /** Recupere le detail complet (embed contacts/adresses/ribs + comptabilite). */
+    function fetchDetail(): Promise<ProviderDetail> {
+        return api.get<ProviderDetail>(
+            `/providers/${id}`,
+            {},
+            { headers: { Accept: 'application/ld+json' }, toast: false },
+        )
+    }
+
+    /** Charge le detail du prestataire. En cas d'echec : `error = true`, `provider = null`. */
+    async function load(): Promise<void> {
+        loading.value = true
+        error.value = false
+        try {
+            provider.value = await fetchDetail()
+        }
+        catch {
+            error.value = true
+            provider.value = null
+        }
+        finally {
+            loading.value = false
+        }
+    }
+
+    /**
+     * Bascule l'archivage (PATCH `isArchived` SEUL — groupe provider:write:archive ;
+     * tout autre champ => 422), puis RECHARGE le detail complet : la reponse du PATCH
+     * ne porte que `provider:read` (ni l'embed des sous-collections ni les libelles
+     * comptables), un simple merge laisserait l'affichage incoherent. Toute erreur est
+     * propagee a l'appelant AVANT le rechargement.
+     */
+    async function setArchived(isArchived: boolean): Promise<void> {
+        await api.patch(`/providers/${id}`, { isArchived }, { toast: false })
+        provider.value = await fetchDetail()
+    }
+
+    return {
+        provider,
+        loading,
+        error,
+        load,
+        archive: () => setArchived(true),
+        restore: () => setArchived(false),
+    }
+}
diff --git a/frontend/modules/technique/composables/useProviderForm.ts b/frontend/modules/technique/composables/useProviderForm.ts
index af1e090..8b4d821 100644
--- a/frontend/modules/technique/composables/useProviderForm.ts
+++ b/frontend/modules/technique/composables/useProviderForm.ts
@@ -91,6 +91,9 @@ export function useProviderForm() {
     const activeTab = ref<string>('contact')
     // Onglets valides (passent en lecture seule).
     const validated = reactive<Record<string, boolean>>({})
+    // Mode MODIFICATION (ERP-145) : navigation libre, pas de verrouillage ni de
+    // bascule automatique d'onglet a la validation (cf. completeTab).
+    const editMode = ref(false)
 
     function isValidated(key: string): boolean {
         return validated[key] === true
@@ -192,12 +195,55 @@ export function useProviderForm() {
         await api.patch(`/providers/${providerId.value}`, payload, { toast: false })
     }
 
+    /**
+     * MODIFICATION du bloc principal (ERP-145) : PATCH /providers/{id} sur le groupe
+     * provider:write:main (nom + categories + sites). Pre-check front RG-3.03/3.09,
+     * 409 doublon de nom (RG-3.10) et 422 mappes inline comme a la creation. A la
+     * difference de `submitMain`, ne verrouille rien et ne bascule pas d'onglet (la
+     * navigation est libre en modification). Retourne true si le PATCH a reussi.
+     */
+    async function updateMain(): Promise<boolean> {
+        if (providerId.value === null || mainSubmitting.value) return false
+        mainErrors.clearErrors()
+        if (!validateMainFront()) return false
+
+        mainSubmitting.value = true
+        try {
+            const updated = await api.patch<ProviderMainResponse>(
+                `/providers/${providerId.value}`,
+                buildMainPayload(),
+                { toast: false },
+            )
+            main.companyName = updated.companyName ?? main.companyName
+            return true
+        }
+        catch (error) {
+            const status = (error as { response?: { status?: number } })?.response?.status
+            if (status === 409) {
+                const message = t('technique.providers.form.duplicateCompany')
+                mainErrors.setError('companyName', message)
+                toast.error({ title: t('technique.providers.toast.error'), message })
+            }
+            else {
+                mainErrors.handleApiError(error, { fallbackMessage: t('technique.providers.toast.error') })
+            }
+            return false
+        }
+        finally {
+            mainSubmitting.value = false
+        }
+    }
+
     /**
      * Marque un onglet valide (passe en lecture seule), deverrouille et avance a
      * l'onglet suivant. Retourne true si c'etait le dernier onglet du flux
      * (creation terminee), false sinon.
      */
     function completeTab(key: string): boolean {
+        // En modification : navigation libre, l'onglet reste editable apres validation.
+        if (editMode.value) {
+            return false
+        }
         validated[key] = true
         const index = tabIndex(key)
         const next = tabKeys.value[index + 1]
@@ -521,6 +567,7 @@ export function useProviderForm() {
         activeTab,
         unlockedIndex,
         validated,
+        editMode,
         isValidated,
         // contacts
         contacts,
@@ -551,6 +598,7 @@ export function useProviderForm() {
         validateMainFront,
         buildMainPayload,
         submitMain,
+        updateMain,
         patchProvider,
         completeTab,
         submitRows,
diff --git a/frontend/modules/technique/pages/providers/[id]/edit.vue b/frontend/modules/technique/pages/providers/[id]/edit.vue
new file mode 100644
index 0000000..a60fec5
--- /dev/null
+++ b/frontend/modules/technique/pages/providers/[id]/edit.vue
@@ -0,0 +1,534 @@
+<template>
+    <div>
+        <!-- En-tete : retour consultation + nom du prestataire. -->
+        <div class="flex items-center gap-3 pt-11">
+            <MalioButtonIcon
+                icon="mdi:arrow-left-bold"
+                icon-size="24"
+                variant="ghost"
+                v-bind="{ ariaLabel: t('technique.providers.edit.back') }"
+                @click="goBack"
+            />
+            <h1 class="text-[30px] font-semibold text-m-primary">{{ headerTitle }}</h1>
+        </div>
+
+        <!-- Etats de chargement / introuvable. -->
+        <p v-if="loading" class="mt-12 text-center text-black/60">{{ t('technique.providers.edit.loading') }}</p>
+        <p v-else-if="error" class="mt-12 text-center text-m-danger">{{ t('technique.providers.edit.notFound') }}</p>
+
+        <template v-else-if="provider">
+            <!-- ── Bloc principal (pre-rempli, editable si `manage`) ──────────── -->
+            <div class="mt-[48px] grid grid-cols-3 xl:grid-cols-4 gap-x-[44px] gap-y-4">
+                <MalioInputText
+                    v-model="main.companyName"
+                    :label="t('technique.providers.form.main.companyName')"
+                    :required="true"
+                    :readonly="businessReadonly"
+                    :error="mainErrors.errors.companyName"
+                />
+                <MalioSelectCheckbox
+                    :model-value="main.categoryIris"
+                    :options="referentials.categories.value"
+                    :label="t('technique.providers.form.main.categories')"
+                    :display-tag="true"
+                    :readonly="businessReadonly"
+                    :required="true"
+                    :error="mainErrors.errors.categories"
+                    @update:model-value="(v: (string | number)[]) => main.categoryIris = v.map(String)"
+                />
+                <MalioSelectCheckbox
+                    :model-value="main.siteIris"
+                    :options="referentials.sites.value"
+                    :label="t('technique.providers.form.main.sites')"
+                    :display-tag="true"
+                    :readonly="businessReadonly"
+                    :required="true"
+                    :error="mainErrors.errors.sites"
+                    @update:model-value="(v: (string | number)[]) => main.siteIris = v.map(String)"
+                />
+            </div>
+
+            <div v-if="!businessReadonly" class="mt-12 flex justify-center">
+                <MalioButton
+                    variant="primary"
+                    :label="t('technique.providers.edit.save')"
+                    :disabled="mainSubmitting"
+                    @click="onUpdateMain"
+                />
+            </div>
+
+            <!-- ── Onglets : navigation LIBRE, edition independante par onglet ──── -->
+            <MalioTabList v-model="activeTab" :tabs="tabs" :max-visible-tabs="5" :max-width="1100" class="mt-[60px]">
+                <!-- Onglet Contact -->
+                <template #contact>
+                    <div class="mt-12 flex flex-col gap-6">
+                        <ProviderContactBlock
+                            v-for="(contact, index) in contacts"
+                            :key="index"
+                            :model-value="contact"
+                            :removable="index > 0"
+                            :readonly="businessReadonly"
+                            :errors="contactErrors[index]"
+                            @update:model-value="(v) => contacts[index] = v"
+                            @remove="askRemoveContact(index)"
+                        />
+                        <div v-if="!businessReadonly" class="flex justify-center gap-6">
+                            <MalioButton
+                                variant="secondary"
+                                icon-name="mdi:add-bold"
+                                icon-position="left"
+                                :label="t('technique.providers.form.contact.add')"
+                                :disabled="!canAddContact"
+                                @click="addContact"
+                            />
+                            <MalioButton
+                                variant="primary"
+                                :label="t('technique.providers.edit.save')"
+                                :disabled="tabSubmitting"
+                                @click="onSubmitContacts"
+                            />
+                        </div>
+                    </div>
+                </template>
+
+                <!-- Onglet Adresse -->
+                <template #address>
+                    <div class="mt-12 flex flex-col gap-6">
+                        <ProviderAddressBlock
+                            v-for="(address, index) in addresses"
+                            :key="index"
+                            :model-value="address"
+                            :category-options="referentials.categories.value"
+                            :site-options="referentials.sites.value"
+                            :contact-options="contactOptions"
+                            :country-options="countryOptions"
+                            :removable="index > 0"
+                            :readonly="businessReadonly"
+                            :errors="addressErrors[index]"
+                            @update:model-value="(v) => addresses[index] = v"
+                            @remove="askRemoveAddress(index)"
+                            @degraded="onAddressDegraded"
+                        />
+                        <div v-if="!businessReadonly" class="flex justify-center gap-6">
+                            <MalioButton
+                                variant="secondary"
+                                icon-name="mdi:add-bold"
+                                icon-position="left"
+                                :label="t('technique.providers.form.address.add')"
+                                :disabled="!canAddAddress"
+                                @click="addAddress"
+                            />
+                            <MalioButton
+                                variant="primary"
+                                :label="t('technique.providers.edit.save')"
+                                :disabled="tabSubmitting"
+                                @click="onSubmitAddresses"
+                            />
+                        </div>
+                    </div>
+                </template>
+
+                <!-- Onglet Comptabilite (present si accounting.view ; editable si manage). -->
+                <template v-if="canAccountingView" #accounting>
+                    <div class="mt-12 flex flex-col gap-6">
+                        <div class="bg-white py-4 pl-[28px] pr-[60px] shadow-[0_4px_4px_0_rgba(0,0,0,0.25)]">
+                            <div class="grid grid-cols-4 gap-x-[44px] gap-y-4">
+                                <MalioInputText
+                                    v-model="accounting.siren"
+                                    :label="t('technique.providers.form.accounting.siren')"
+                                    :mask="SIREN_MASK"
+                                    :readonly="accountingReadonly"
+                                    :required="true"
+                                    :error="accountingErrors.errors.siren"
+                                />
+                                <MalioInputText
+                                    v-model="accounting.accountNumber"
+                                    :label="t('technique.providers.form.accounting.accountNumber')"
+                                    :readonly="accountingReadonly"
+                                    :required="true"
+                                    :error="accountingErrors.errors.accountNumber"
+                                />
+                                <MalioSelect
+                                    :model-value="accounting.tvaModeIri"
+                                    :options="referentials.tvaModes.value"
+                                    :label="t('technique.providers.form.accounting.tvaMode')"
+                                    :readonly="accountingReadonly"
+                                    empty-option-label=""
+                                    :required="true"
+                                    :error="accountingErrors.errors.tvaMode"
+                                    @update:model-value="(v: string | number | null) => accounting.tvaModeIri = v === null ? null : String(v)"
+                                />
+                                <MalioInputText
+                                    v-model="accounting.nTva"
+                                    :label="t('technique.providers.form.accounting.nTva')"
+                                    :readonly="accountingReadonly"
+                                    :required="true"
+                                    :error="accountingErrors.errors.nTva"
+                                />
+                                <MalioSelect
+                                    :model-value="accounting.paymentDelayIri"
+                                    :options="referentials.paymentDelays.value"
+                                    :label="t('technique.providers.form.accounting.paymentDelay')"
+                                    :readonly="accountingReadonly"
+                                    empty-option-label=""
+                                    :required="true"
+                                    :error="accountingErrors.errors.paymentDelay"
+                                    @update:model-value="(v: string | number | null) => accounting.paymentDelayIri = v === null ? null : String(v)"
+                                />
+                                <MalioSelect
+                                    :model-value="accounting.paymentTypeIri"
+                                    :options="referentials.paymentTypes.value"
+                                    :label="t('technique.providers.form.accounting.paymentType')"
+                                    :readonly="accountingReadonly"
+                                    empty-option-label=""
+                                    :required="true"
+                                    :error="accountingErrors.errors.paymentType"
+                                    @update:model-value="onPaymentTypeChange"
+                                />
+                                <MalioSelect
+                                    v-if="isBankRequired"
+                                    :model-value="accounting.bankIri"
+                                    :options="referentials.banks.value"
+                                    :label="t('technique.providers.form.accounting.bank')"
+                                    :readonly="accountingReadonly"
+                                    empty-option-label=""
+                                    :required="true"
+                                    :error="accountingErrors.errors.bank"
+                                    @update:model-value="(v: string | number | null) => accounting.bankIri = v === null ? null : String(v)"
+                                />
+                            </div>
+                        </div>
+
+                        <!-- Blocs RIB — affiches uniquement si type de reglement = LCR (RG-3.08). -->
+                        <div
+                            v-for="(rib, index) in visibleRibs"
+                            :key="index"
+                            class="relative bg-white py-4 pl-[28px] pr-[60px] shadow-[0_4px_4px_0_rgba(0,0,0,0.25)]"
+                        >
+                            <MalioButtonIcon
+                                v-if="!accountingReadonly && visibleRibs.length > 1"
+                                icon="mdi:delete-outline"
+                                variant="ghost"
+                                button-class="absolute top-3 right-3"
+                                v-bind="{ ariaLabel: t('technique.providers.form.accounting.removeRib') }"
+                                @click="askRemoveRib(index)"
+                            />
+                            <div class="grid grid-cols-4 gap-x-[44px] gap-y-4">
+                                <MalioInputText
+                                    v-model="rib.label"
+                                    :label="t('technique.providers.form.accounting.ribLabel')"
+                                    :readonly="accountingReadonly"
+                                    :required="true"
+                                    :error="ribErrors[index]?.label"
+                                />
+                                <MalioInputText
+                                    v-model="rib.bic"
+                                    :label="t('technique.providers.form.accounting.ribBic')"
+                                    :readonly="accountingReadonly"
+                                    :required="true"
+                                    :error="ribErrors[index]?.bic"
+                                />
+                                <MalioInputText
+                                    v-model="rib.iban"
+                                    :label="t('technique.providers.form.accounting.ribIban')"
+                                    :readonly="accountingReadonly"
+                                    :required="true"
+                                    :error="ribErrors[index]?.iban"
+                                />
+                            </div>
+                        </div>
+
+                        <div v-if="!accountingReadonly" class="flex justify-center gap-6">
+                            <MalioButton
+                                v-if="isRibRequired"
+                                variant="secondary"
+                                icon-name="mdi:add-bold"
+                                icon-position="left"
+                                :label="t('technique.providers.form.accounting.addRib')"
+                                :disabled="!canAddRib"
+                                @click="addRib"
+                            />
+                            <MalioButton
+                                variant="primary"
+                                :label="t('technique.providers.edit.save')"
+                                :disabled="tabSubmitting"
+                                @click="onSubmitAccounting"
+                            />
+                        </div>
+                    </div>
+                </template>
+            </MalioTabList>
+        </template>
+
+        <!-- Modal de confirmation generique (suppression contact / adresse / RIB). -->
+        <MalioModal v-model="confirmModal.open" modal-class="max-w-md">
+            <template #header>
+                <h2 class="text-[24px] font-bold">{{ t('technique.providers.form.confirmDelete.title') }}</h2>
+            </template>
+            <p>{{ confirmModal.message }}</p>
+            <template #footer>
+                <MalioButton
+                    variant="secondary"
+                    button-class="flex-1"
+                    :label="t('technique.providers.form.confirmDelete.cancel')"
+                    @click="confirmModal.open = false"
+                />
+                <MalioButton
+                    variant="danger"
+                    button-class="flex-1"
+                    :label="t('technique.providers.form.confirmDelete.confirm')"
+                    @click="runConfirm"
+                />
+            </template>
+        </MalioModal>
+    </div>
+</template>
+
+<script setup lang="ts">
+import { computed, onMounted, reactive, ref } from 'vue'
+import { useProvider } from '~/modules/technique/composables/useProvider'
+import { useProviderReferentials, type RefOption } from '~/modules/technique/composables/useProviderReferentials'
+import { useProviderForm } from '~/modules/technique/composables/useProviderForm'
+import {
+    canEditProvider,
+    irisOf,
+    mapAccountingDraft,
+    mapAddressToDraft,
+    mapContactToDraft,
+    mapRibToDraft,
+    paymentTypeCodeOf,
+} from '~/modules/technique/utils/forms/providerDetail'
+import {
+    isBankRequiredForPaymentType,
+    isRibRequiredForPaymentType,
+} from '~/modules/technique/utils/forms/providerAccounting'
+import {
+    emptyProviderAddress,
+    emptyProviderContact,
+    emptyProviderRib,
+} from '~/modules/technique/types/providerForm'
+import { extractApiErrorMessage } from '~/shared/utils/api'
+
+// Masque SIREN : 9 chiffres (la normalisation finale reste serveur).
+const SIREN_MASK = '#########'
+
+const { t } = useI18n()
+const route = useRoute()
+const router = useRouter()
+const toast = useToast()
+const { can, canAny } = usePermissions()
+
+const providerId = route.params.id as string
+
+// Acces : l'edition exige `manage` OU `accounting.manage` (le role Compta edite
+// son onglet). Sinon retour consultation.
+if (!canEditProvider(canAny)) {
+    await navigateTo(`/providers/${providerId}`)
+}
+
+const businessReadonly = computed(() => !can('technique.providers.manage'))
+
+const referentials = useProviderReferentials()
+const { provider, loading, error, load } = useProvider(providerId)
+
+const {
+    main,
+    mainErrors,
+    mainSubmitting,
+    tabSubmitting,
+    editMode,
+    canAccountingView,
+    tabKeys,
+    activeTab,
+    contacts,
+    contactErrors,
+    canAddContact,
+    addContact,
+    removeContact,
+    submitContacts,
+    addresses,
+    addressErrors,
+    canAddAddress,
+    addAddress,
+    removeAddress,
+    submitAddresses,
+    accounting,
+    ribs,
+    accountingErrors,
+    ribErrors,
+    accountingReadonly,
+    setPaymentType,
+    canAddRib,
+    addRib,
+    removeRib,
+    submitAccounting,
+    updateMain,
+} = useProviderForm()
+
+// Modification : navigation libre + pas de verrouillage a la validation.
+editMode.value = true
+activeTab.value = 'contact'
+
+const headerTitle = computed(() => provider.value?.companyName || t('technique.providers.edit.title'))
+useHead({ title: t('technique.providers.edit.title') })
+
+// ── Onglets (navigation libre ; Comptabilite si accounting.view) ───────────────
+const TAB_ICONS: Record<string, string> = {
+    contact: 'mdi:account-box-plus-outline',
+    address: 'mdi:map-marker-outline',
+    accounting: 'mdi:bank-circle-outline',
+}
+const tabs = computed(() => tabKeys.value.map(key => ({
+    key,
+    label: t(`technique.providers.tab.${key}`),
+    icon: TAB_ICONS[key],
+})))
+
+/** Pre-remplit les brouillons depuis la SEULE reponse detail. */
+function prefill(): void {
+    const d = provider.value
+    if (!d) return
+
+    main.companyName = d.companyName ?? null
+    main.categoryIris = irisOf(d.categories)
+    main.siteIris = irisOf(d.sites)
+
+    const mappedContacts = (d.contacts ?? []).map(mapContactToDraft)
+    contacts.value = mappedContacts.length > 0 ? mappedContacts : [emptyProviderContact()]
+
+    const mappedAddresses = (d.addresses ?? []).map(mapAddressToDraft)
+    addresses.value = mappedAddresses.length > 0 ? mappedAddresses : [emptyProviderAddress()]
+
+    if (canAccountingView.value) {
+        Object.assign(accounting, mapAccountingDraft(d))
+        ribs.value = (d.ribs ?? []).map(mapRibToDraft)
+        // Garantit un bloc RIB visible si le type de reglement est LCR.
+        if (isRibRequiredForPaymentType(paymentTypeCodeOf(d.paymentType)) && ribs.value.length === 0) {
+            ribs.value.push(emptyProviderRib())
+        }
+    }
+}
+
+// ── Comptabilite : RG-3.07 / RG-3.08 pilotees par le code du type de reglement ──
+const selectedPaymentTypeCode = computed(() =>
+    referentials.paymentTypes.value.find(p => p.value === accounting.paymentTypeIri)?.code ?? null,
+)
+const isBankRequired = computed(() => isBankRequiredForPaymentType(selectedPaymentTypeCode.value))
+const isRibRequired = computed(() => isRibRequiredForPaymentType(selectedPaymentTypeCode.value))
+const visibleRibs = computed(() => isRibRequired.value ? ribs.value : [])
+
+function onPaymentTypeChange(value: string | number | null): void {
+    const iri = value === null ? null : String(value)
+    const code = referentials.paymentTypes.value.find(p => p.value === iri)?.code ?? null
+    setPaymentType(iri, isBankRequiredForPaymentType(code), isRibRequiredForPaymentType(code))
+}
+
+// ── Options adresses ──────────────────────────────────────────────────────────
+const contactOptions = computed<RefOption[]>(() =>
+    contacts.value
+        .filter(c => c.iri !== null)
+        .map(c => ({
+            value: c.iri as string,
+            label: [c.firstName, c.lastName].filter(Boolean).join(' ') || (c.email ?? ''),
+        })),
+)
+
+const countryOptions = computed<RefOption[]>(() => {
+    const list = referentials.countries.value
+    return list.some(c => c.value === 'France')
+        ? list
+        : [{ value: 'France', label: 'France' }, ...list]
+})
+
+const addressDegradedNotified = ref(false)
+function onAddressDegraded(): void {
+    if (addressDegradedNotified.value) return
+    addressDegradedNotified.value = true
+    toast.warning({
+        title: t('technique.providers.toast.error'),
+        message: t('technique.providers.form.address.degraded'),
+    })
+}
+
+// ── Navigation + helpers ──────────────────────────────────────────────────────
+function goBack(): void {
+    router.push(`/providers/${providerId}`)
+}
+
+function apiErrorMessage(err: unknown): string {
+    const data = (err as { response?: { _data?: unknown } })?.response?._data
+    return extractApiErrorMessage(data) || t('technique.providers.toast.error')
+}
+
+/** PATCH du bloc principal (groupe provider:write:main). */
+async function onUpdateMain(): Promise<void> {
+    if (await updateMain()) {
+        toast.success({ title: t('technique.providers.toast.updateSuccess') })
+    }
+}
+
+async function onSubmitContacts(): Promise<void> {
+    const ok = await submitContacts(err => toast.error({
+        title: t('technique.providers.toast.error'),
+        message: apiErrorMessage(err),
+    }))
+    if (ok) toast.success({ title: t('technique.providers.toast.updateSuccess') })
+}
+
+async function onSubmitAddresses(): Promise<void> {
+    const ok = await submitAddresses(err => toast.error({
+        title: t('technique.providers.toast.error'),
+        message: apiErrorMessage(err),
+    }))
+    if (ok) toast.success({ title: t('technique.providers.toast.updateSuccess') })
+}
+
+async function onSubmitAccounting(): Promise<void> {
+    const ok = await submitAccounting(
+        isBankRequired.value,
+        isRibRequired.value,
+        err => toast.error({ title: t('technique.providers.toast.error'), message: apiErrorMessage(err) }),
+    )
+    if (ok) toast.success({ title: t('technique.providers.toast.updateSuccess') })
+}
+
+// ── Modal de confirmation generique ───────────────────────────────────────────
+const confirmModal = reactive({
+    open: false,
+    message: '',
+    action: null as null | (() => void),
+})
+
+function askConfirm(message: string, action: () => void): void {
+    confirmModal.message = message
+    confirmModal.action = action
+    confirmModal.open = true
+}
+
+function runConfirm(): void {
+    confirmModal.action?.()
+    confirmModal.action = null
+    confirmModal.open = false
+}
+
+function askRemoveContact(index: number): void {
+    askConfirm(t('technique.providers.form.confirmDelete.contact'), () => removeContact(index))
+}
+
+function askRemoveAddress(index: number): void {
+    askConfirm(t('technique.providers.form.confirmDelete.address'), () => removeAddress(index))
+}
+
+function askRemoveRib(index: number): void {
+    askConfirm(t('technique.providers.form.confirmDelete.rib'), () => removeRib(index))
+}
+
+onMounted(async () => {
+    referentials.loadMain().catch(() => {})
+    if (canAccountingView.value) {
+        referentials.loadAccounting().catch(() => {})
+    }
+    await load()
+    prefill()
+})
+</script>
diff --git a/frontend/modules/technique/pages/providers/[id]/index.vue b/frontend/modules/technique/pages/providers/[id]/index.vue
new file mode 100644
index 0000000..f10e1b3
--- /dev/null
+++ b/frontend/modules/technique/pages/providers/[id]/index.vue
@@ -0,0 +1,303 @@
+<template>
+    <div>
+        <!-- En-tete : retour repertoire + nom du prestataire + actions. -->
+        <div class="flex items-center gap-3 pt-11">
+            <MalioButtonIcon
+                icon="mdi:arrow-left-bold"
+                icon-size="24"
+                variant="ghost"
+                v-bind="{ ariaLabel: t('technique.providers.consultation.back') }"
+                @click="goBack"
+            />
+            <h1 class="text-[30px] font-semibold text-m-primary">{{ headerTitle }}</h1>
+
+            <div class="ml-auto flex items-center gap-12">
+                <MalioButton
+                    v-if="canEdit"
+                    variant="secondary"
+                    icon-name="mdi:pencil-outline"
+                    icon-position="left"
+                    :label="t('technique.providers.action.edit')"
+                    @click="goEdit"
+                />
+                <MalioButton
+                    v-if="showArchive"
+                    variant="secondary"
+                    icon-name="mdi:archive-arrow-down-outline"
+                    icon-position="left"
+                    :label="t('technique.providers.action.archive')"
+                    @click="askToggleArchive"
+                />
+                <MalioButton
+                    v-if="showRestore"
+                    variant="secondary"
+                    icon-name="mdi:archive-arrow-up-outline"
+                    icon-position="left"
+                    :label="t('technique.providers.action.restore')"
+                    @click="askToggleArchive"
+                />
+            </div>
+        </div>
+
+        <!-- Etats de chargement / introuvable. -->
+        <p v-if="loading" class="mt-12 text-center text-black/60">{{ t('technique.providers.consultation.loading') }}</p>
+        <p v-else-if="error" class="mt-12 text-center text-m-danger">{{ t('technique.providers.consultation.notFound') }}</p>
+
+        <template v-else-if="provider">
+            <!-- ── Bloc principal (lecture seule) ─────────────────────────────── -->
+            <div class="mt-[48px] grid grid-cols-3 xl:grid-cols-4 gap-x-[44px] gap-y-4">
+                <MalioInputText
+                    :model-value="provider.companyName"
+                    :label="t('technique.providers.form.main.companyName')"
+                    readonly
+                />
+                <MalioSelectCheckbox
+                    :model-value="mainCategoryIris"
+                    :options="mainCategoryOptions"
+                    :label="t('technique.providers.form.main.categories')"
+                    :display-tag="true"
+                    readonly
+                />
+                <MalioSelectCheckbox
+                    :model-value="mainSiteIris"
+                    :options="mainSiteOptions"
+                    :label="t('technique.providers.form.main.sites')"
+                    :display-tag="true"
+                    readonly
+                />
+            </div>
+
+            <!-- ── Onglets (navigation libre, tout en lecture seule) ──────────── -->
+            <MalioTabList v-model="activeTab" :tabs="tabs" :max-visible-tabs="5" :max-width="1100" class="mt-[60px]">
+                <!-- Onglet Contacts -->
+                <template #contacts>
+                    <div class="mt-12 flex flex-col gap-6">
+                        <ProviderContactBlock
+                            v-for="(contact, index) in contacts"
+                            :key="index"
+                            :model-value="contact"
+                            readonly
+                        />
+                        <p v-if="contacts.length === 0" class="text-center text-black/60">
+                            {{ t('technique.providers.consultation.emptyContacts') }}
+                        </p>
+                    </div>
+                </template>
+
+                <!-- Onglet Adresse -->
+                <template #address>
+                    <div class="mt-12 flex flex-col gap-6">
+                        <ProviderAddressBlock
+                            v-for="(view, index) in addressViews"
+                            :key="index"
+                            :model-value="view.draft"
+                            :category-options="view.categoryOptions"
+                            :site-options="view.siteOptions"
+                            :contact-options="contactOptions"
+                            :country-options="countryOptionsFor(view.draft.country)"
+                            readonly
+                        />
+                        <p v-if="addressViews.length === 0" class="text-center text-black/60">
+                            {{ t('technique.providers.consultation.emptyAddresses') }}
+                        </p>
+                    </div>
+                </template>
+
+                <!-- Onglets placeholder « A venir » (comme les autres modules). -->
+                <template #reports><ComingSoonPlaceholder /></template>
+                <template #exchanges><ComingSoonPlaceholder /></template>
+
+                <!-- Onglet Comptabilite (present uniquement si accounting.view). -->
+                <template v-if="canAccountingView" #accounting>
+                    <div class="mt-12 flex flex-col gap-6">
+                        <div class="bg-white py-4 pl-[28px] pr-[60px] shadow-[0_4px_4px_0_rgba(0,0,0,0.25)]">
+                            <div class="grid grid-cols-4 gap-x-[44px] gap-y-4">
+                                <MalioInputText :model-value="accounting.siren" :label="t('technique.providers.form.accounting.siren')" readonly />
+                                <MalioInputText :model-value="accounting.accountNumber" :label="t('technique.providers.form.accounting.accountNumber')" readonly />
+                                <MalioSelect :model-value="accounting.tvaModeIri" :options="tvaModeOptions" :label="t('technique.providers.form.accounting.tvaMode')" readonly empty-option-label="" />
+                                <MalioInputText :model-value="accounting.nTva" :label="t('technique.providers.form.accounting.nTva')" readonly />
+                                <MalioSelect :model-value="accounting.paymentDelayIri" :options="paymentDelayOptions" :label="t('technique.providers.form.accounting.paymentDelay')" readonly empty-option-label="" />
+                                <MalioSelect :model-value="accounting.paymentTypeIri" :options="paymentTypeOptions" :label="t('technique.providers.form.accounting.paymentType')" readonly empty-option-label="" />
+                                <MalioSelect v-if="isBankRequired" :model-value="accounting.bankIri" :options="bankOptions" :label="t('technique.providers.form.accounting.bank')" readonly empty-option-label="" />
+                            </div>
+                        </div>
+
+                        <!-- Blocs RIB (uniquement si type de reglement = LCR). -->
+                        <div
+                            v-for="(rib, index) in visibleRibs"
+                            :key="index"
+                            class="bg-white py-4 pl-[28px] pr-[60px] shadow-[0_4px_4px_0_rgba(0,0,0,0.25)]"
+                        >
+                            <div class="grid grid-cols-4 gap-x-[44px] gap-y-4">
+                                <MalioInputText :model-value="rib.label" :label="t('technique.providers.form.accounting.ribLabel')" readonly />
+                                <MalioInputText :model-value="rib.bic" :label="t('technique.providers.form.accounting.ribBic')" readonly />
+                                <MalioInputText :model-value="rib.iban" :label="t('technique.providers.form.accounting.ribIban')" readonly />
+                            </div>
+                        </div>
+                    </div>
+                </template>
+            </MalioTabList>
+        </template>
+
+        <!-- Modal de confirmation archivage / restauration. -->
+        <MalioModal v-model="confirmArchive.open" modal-class="max-w-md">
+            <template #header>
+                <h2 class="text-[24px] font-bold">{{ confirmArchive.title }}</h2>
+            </template>
+            <p>{{ confirmArchive.message }}</p>
+            <template #footer>
+                <MalioButton
+                    variant="secondary"
+                    button-class="flex-1"
+                    :label="t('technique.providers.form.confirmDelete.cancel')"
+                    @click="confirmArchive.open = false"
+                />
+                <MalioButton
+                    variant="danger"
+                    button-class="flex-1"
+                    :label="confirmArchive.confirmLabel"
+                    @click="runToggleArchive"
+                />
+            </template>
+        </MalioModal>
+    </div>
+</template>
+
+<script setup lang="ts">
+import { computed, onMounted, reactive, ref } from 'vue'
+import { useProvider } from '~/modules/technique/composables/useProvider'
+import {
+    canEditProvider,
+    categoryOptionsOf,
+    contactOptionsOf,
+    irisOf,
+    mapAccountingDraft,
+    mapAddressToDraft,
+    mapContactToDraft,
+    mapRibToDraft,
+    paymentTypeCodeOf,
+    referentialOptionOf,
+    showArchiveAction,
+    showRestoreAction,
+    siteOptionsOf,
+} from '~/modules/technique/utils/forms/providerDetail'
+import { isBankRequiredForPaymentType, isRibRequiredForPaymentType } from '~/modules/technique/utils/forms/providerAccounting'
+
+const { t } = useI18n()
+const route = useRoute()
+const router = useRouter()
+const toast = useToast()
+const { can, canAny } = usePermissions()
+
+const providerId = route.params.id as string
+const { provider, loading, error, load, archive, restore } = useProvider(providerId)
+
+const canAccountingView = computed(() => can('technique.providers.accounting.view'))
+const canEdit = computed(() => canEditProvider(canAny))
+const isArchived = computed(() => provider.value?.isArchived ?? false)
+const showArchive = computed(() => showArchiveAction(can, isArchived.value))
+const showRestore = computed(() => showRestoreAction(can, isArchived.value))
+
+const headerTitle = computed(() => provider.value?.companyName || t('technique.providers.consultation.title'))
+useHead({ title: t('technique.providers.consultation.title') })
+
+// ── Onglets (ordre spec : Contacts · Adresse · Rapports · Échanges · Comptabilité) ──
+const activeTab = ref('contacts')
+const TAB_ICONS: Record<string, string> = {
+    contacts: 'mdi:account-box-plus-outline',
+    address: 'mdi:map-marker-outline',
+    reports: 'mdi:file-chart-outline',
+    exchanges: 'mdi:swap-horizontal',
+    accounting: 'mdi:bank-circle-outline',
+}
+const tabs = computed(() => {
+    const keys = ['contacts', 'address', 'reports', 'exchanges']
+    if (canAccountingView.value) keys.push('accounting')
+    return keys.map(key => ({ key, label: t(`technique.providers.tab.${key}`), icon: TAB_ICONS[key] }))
+})
+
+// ── Donnees mappees depuis la SEULE reponse detail ─────────────────────────────
+const mainCategoryIris = computed(() => irisOf(provider.value?.categories))
+const mainSiteIris = computed(() => irisOf(provider.value?.sites))
+const mainCategoryOptions = computed(() => categoryOptionsOf(provider.value?.categories))
+const mainSiteOptions = computed(() => siteOptionsOf(provider.value?.sites))
+
+const contacts = computed(() => (provider.value?.contacts ?? []).map(mapContactToDraft))
+// Contacts rattachables (pour resoudre les libelles des contacts lies aux adresses).
+const contactOptions = computed(() => contactOptionsOf(provider.value?.contacts))
+
+// Vue par adresse : brouillon + options propres a l'adresse (sites/categories embarques).
+const addressViews = computed(() => (provider.value?.addresses ?? []).map(address => ({
+    draft: mapAddressToDraft(address),
+    siteOptions: siteOptionsOf(address.sites),
+    categoryOptions: categoryOptionsOf(address.categories),
+})))
+
+/** Pays : une seule option (la valeur courante), suffisant pour l'affichage readonly. */
+function countryOptionsFor(country: string): { value: string, label: string }[] {
+    return country ? [{ value: country, label: country }] : []
+}
+
+// ── Comptabilite (presente uniquement si accounting.view) ──────────────────────
+const accounting = computed(() => mapAccountingDraft(provider.value ?? { id: 0, '@id': '' }))
+const paymentTypeCode = computed(() => paymentTypeCodeOf(provider.value?.paymentType))
+const isBankRequired = computed(() => isBankRequiredForPaymentType(paymentTypeCode.value))
+const isRibRequired = computed(() => isRibRequiredForPaymentType(paymentTypeCode.value))
+const visibleRibs = computed(() => isRibRequired.value ? (provider.value?.ribs ?? []).map(mapRibToDraft) : [])
+
+// Options « une entree » construites depuis l'embed (libelles role-independants).
+const tvaModeOptions = computed(() => referentialOptionOf(provider.value?.tvaMode))
+const paymentDelayOptions = computed(() => referentialOptionOf(provider.value?.paymentDelay))
+const paymentTypeOptions = computed(() => referentialOptionOf(provider.value?.paymentType))
+const bankOptions = computed(() => referentialOptionOf(provider.value?.bank))
+
+// ── Navigation / actions ───────────────────────────────────────────────────────
+function goBack(): void {
+    router.push('/providers')
+}
+
+function goEdit(): void {
+    router.push(`/providers/${providerId}/edit`)
+}
+
+// ── Archivage / restauration ───────────────────────────────────────────────────
+const confirmArchive = reactive({
+    open: false,
+    title: '',
+    message: '',
+    confirmLabel: '',
+})
+
+function askToggleArchive(): void {
+    const archiving = !isArchived.value
+    confirmArchive.title = archiving
+        ? t('technique.providers.action.archive')
+        : t('technique.providers.action.restore')
+    confirmArchive.message = archiving
+        ? t('technique.providers.consultation.confirmArchive')
+        : t('technique.providers.consultation.confirmRestore')
+    confirmArchive.confirmLabel = archiving
+        ? t('technique.providers.action.archive')
+        : t('technique.providers.action.restore')
+    confirmArchive.open = true
+}
+
+async function runToggleArchive(): Promise<void> {
+    const archiving = !isArchived.value
+    confirmArchive.open = false
+    try {
+        await (archiving ? archive() : restore())
+        toast.success({
+            title: archiving
+                ? t('technique.providers.toast.archiveSuccess')
+                : t('technique.providers.toast.restoreSuccess'),
+        })
+    }
+    catch {
+        // 409 a la restauration (homonyme actif) ou autre : toast generique.
+        toast.error({ title: t('technique.providers.toast.error') })
+    }
+}
+
+onMounted(load)
+</script>
diff --git a/frontend/modules/technique/utils/forms/__tests__/providerDetail.spec.ts b/frontend/modules/technique/utils/forms/__tests__/providerDetail.spec.ts
new file mode 100644
index 0000000..e939f96
--- /dev/null
+++ b/frontend/modules/technique/utils/forms/__tests__/providerDetail.spec.ts
@@ -0,0 +1,167 @@
+import { describe, it, expect, vi } from 'vitest'
+
+// formatPhoneFR est auto-importe dans le helper via le chemin partage ; on le mocke
+// pour un rendu deterministe (la mise en forme exacte est testee ailleurs).
+vi.mock('~/shared/utils/phone', () => ({
+    formatPhoneFR: (v: string) => `fmt(${v})`,
+}))
+
+const {
+    canEditProvider,
+    categoryOptionsOf,
+    contactOptionsOf,
+    iriOf,
+    irisOf,
+    mapAccountingDraft,
+    mapAddressToDraft,
+    mapContactToDraft,
+    mapRibToDraft,
+    paymentTypeCodeOf,
+    referentialOptionOf,
+    showArchiveAction,
+    showRestoreAction,
+    siteOptionsOf,
+} = await import('../providerDetail')
+
+/**
+ * Helpers purs des ecrans Consultation / Modification (ERP-145) : mapping du
+ * detail embarque vers les brouillons + regles d'affichage des actions (Modifier /
+ * Archiver / Restaurer).
+ */
+describe('providerDetail helpers', () => {
+    describe('iriOf / irisOf', () => {
+        it('extrait l\'IRI d\'un objet embarque, d\'un IRI nu, ou null', () => {
+            expect(iriOf({ '@id': '/api/banks/2' })).toBe('/api/banks/2')
+            expect(iriOf('/api/banks/2')).toBe('/api/banks/2')
+            expect(iriOf(null)).toBeNull()
+            expect(iriOf(undefined)).toBeNull()
+        })
+
+        it('extrait les IRI d\'une collection embarquee', () => {
+            expect(irisOf([{ '@id': '/api/sites/1' }, { '@id': '/api/sites/2' }])).toEqual(['/api/sites/1', '/api/sites/2'])
+            expect(irisOf(undefined)).toEqual([])
+        })
+    })
+
+    describe('mapContactToDraft', () => {
+        it('mappe les champs, formate les telephones et derive hasSecondaryPhone', () => {
+            const draft = mapContactToDraft({
+                '@id': '/api/provider_contacts/5',
+                id: 5,
+                firstName: 'Jean',
+                lastName: 'Dupont',
+                phonePrimary: '0102030405',
+                phoneSecondary: '0607080910',
+                email: 'jean@x.fr',
+            })
+            expect(draft).toMatchObject({
+                id: 5,
+                iri: '/api/provider_contacts/5',
+                firstName: 'Jean',
+                lastName: 'Dupont',
+                phonePrimary: 'fmt(0102030405)',
+                phoneSecondary: 'fmt(0607080910)',
+                email: 'jean@x.fr',
+                hasSecondaryPhone: true,
+            })
+        })
+
+        it('hasSecondaryPhone faux sans 2e numero', () => {
+            const draft = mapContactToDraft({ '@id': '/api/provider_contacts/6', id: 6, lastName: 'Doe' })
+            expect(draft.hasSecondaryPhone).toBe(false)
+            expect(draft.phoneSecondary).toBeNull()
+        })
+    })
+
+    describe('mapAddressToDraft', () => {
+        it('extrait les IRI des sites / categories / contacts embarques', () => {
+            const draft = mapAddressToDraft({
+                '@id': '/api/provider_addresses/3',
+                id: 3,
+                country: 'France',
+                postalCode: '86100',
+                city: 'Châtellerault',
+                street: '1 rue du Test',
+                sites: [{ '@id': '/api/sites/1' }],
+                categories: [{ '@id': '/api/categories/7' }],
+                contacts: [{ '@id': '/api/provider_contacts/5' }, '/api/provider_contacts/6'],
+            })
+            expect(draft.siteIris).toEqual(['/api/sites/1'])
+            expect(draft.categoryIris).toEqual(['/api/categories/7'])
+            expect(draft.contactIris).toEqual(['/api/provider_contacts/5', '/api/provider_contacts/6'])
+            expect(draft.id).toBe(3)
+        })
+    })
+
+    describe('mapAccountingDraft / mapRibToDraft', () => {
+        it('mappe les scalaires et les IRI des referentiels embarques', () => {
+            const draft = mapAccountingDraft({
+                '@id': '/api/providers/9',
+                id: 9,
+                siren: '123456789',
+                accountNumber: '4010',
+                nTva: 'FR123',
+                tvaMode: { '@id': '/api/tva_modes/1', label: 'TVA' },
+                paymentType: { '@id': '/api/payment_types/3', code: 'VIREMENT' },
+                bank: { '@id': '/api/banks/2' },
+            })
+            expect(draft.tvaModeIri).toBe('/api/tva_modes/1')
+            expect(draft.paymentTypeIri).toBe('/api/payment_types/3')
+            expect(draft.bankIri).toBe('/api/banks/2')
+            expect(draft.paymentDelayIri).toBeNull()
+            expect(draft.siren).toBe('123456789')
+        })
+
+        it('mappe un RIB embarque', () => {
+            expect(mapRibToDraft({ '@id': '/api/provider_ribs/1', id: 1, label: 'Compte', bic: 'BIC', iban: 'IBAN' }))
+                .toEqual({ id: 1, label: 'Compte', bic: 'BIC', iban: 'IBAN' })
+        })
+    })
+
+    describe('options builders (libelles role-independants depuis l\'embed)', () => {
+        it('categoryOptionsOf / siteOptionsOf / contactOptionsOf', () => {
+            expect(categoryOptionsOf([{ '@id': '/api/categories/7', name: 'Maintenance', code: 'MAINT' }]))
+                .toEqual([{ value: '/api/categories/7', label: 'Maintenance' }])
+            expect(siteOptionsOf([{ '@id': '/api/sites/1', name: 'Châtellerault' }]))
+                .toEqual([{ value: '/api/sites/1', label: 'Châtellerault' }])
+            expect(contactOptionsOf([{ '@id': '/api/provider_contacts/5', id: 5, firstName: 'Jean', lastName: 'Dupont' }]))
+                .toEqual([{ value: '/api/provider_contacts/5', label: 'Jean Dupont' }])
+        })
+
+        it('referentialOptionOf / paymentTypeCodeOf', () => {
+            expect(referentialOptionOf({ '@id': '/api/banks/2', label: 'SG' }))
+                .toEqual([{ value: '/api/banks/2', label: 'SG' }])
+            expect(referentialOptionOf(null)).toEqual([])
+            expect(referentialOptionOf('/api/banks/2')).toEqual([])
+            expect(paymentTypeCodeOf({ '@id': '/api/payment_types/3', code: 'LCR' })).toBe('LCR')
+            expect(paymentTypeCodeOf(null)).toBeNull()
+        })
+    })
+
+    describe('actions selon permissions', () => {
+        /** Fabrique un `can` qui n'autorise que les codes fournis. */
+        const canFor = (granted: string[]) => (code: string) => granted.includes(code)
+        const canAnyFor = (granted: string[]) => (codes: string[]) => codes.some(c => granted.includes(c))
+
+        it('« Modifier » visible avec manage OU accounting.manage (Compta inclus)', () => {
+            expect(canEditProvider(canAnyFor(['technique.providers.manage']))).toBe(true)
+            expect(canEditProvider(canAnyFor(['technique.providers.accounting.manage']))).toBe(true)
+            expect(canEditProvider(canAnyFor(['technique.providers.view']))).toBe(false)
+        })
+
+        it('« Archiver » visible seulement avec archive ET prestataire actif (Admin seul)', () => {
+            const admin = canFor(['technique.providers.archive'])
+            const bureau = canFor(['technique.providers.manage'])
+            expect(showArchiveAction(admin, false)).toBe(true)
+            expect(showArchiveAction(admin, true)).toBe(false) // deja archive -> Restaurer
+            expect(showArchiveAction(bureau, false)).toBe(false) // pas la permission archive
+        })
+
+        it('« Restaurer » visible seulement avec archive ET prestataire archive', () => {
+            const admin = canFor(['technique.providers.archive'])
+            expect(showRestoreAction(admin, true)).toBe(true)
+            expect(showRestoreAction(admin, false)).toBe(false)
+            expect(showRestoreAction(canFor([]), true)).toBe(false)
+        })
+    })
+})
diff --git a/frontend/modules/technique/utils/forms/providerDetail.ts b/frontend/modules/technique/utils/forms/providerDetail.ts
new file mode 100644
index 0000000..36bbd04
--- /dev/null
+++ b/frontend/modules/technique/utils/forms/providerDetail.ts
@@ -0,0 +1,245 @@
+/**
+ * Helpers purs des ecrans Consultation / Modification prestataire (M3 Technique,
+ * ERP-145) — miroir SIMPLIFIE de `supplierConsultation.ts` (M2). Mappent le payload
+ * `GET /api/providers/{id}` (relations embarquees, cf. groupes `provider:item:read`
+ * + `provider:read:accounting`) vers les brouillons « plats » partages avec
+ * `ProviderContactBlock` / `ProviderAddressBlock` et l'onglet Comptabilite.
+ *
+ * Ne touchent ni a l'API ni a l'etat reactif (testables unitairement).
+ *
+ * Rappels de contrat back (JSON reel fige — ERP-139, spec-back § 4.0.bis) :
+ *  - categories / sites du prestataire et des adresses : OBJETS embarques (avec @id) ;
+ *  - refs comptables (tvaMode/paymentDelay/paymentType/bank) : OBJETS embarques
+ *    `{@id, id, label, (code pour paymentType)}` ;
+ *  - champs nuls OMIS (skip_null_values) → toujours lire avec `?? null` ;
+ *  - champs comptables + `ribs` TOTALEMENT ABSENTS sans permission accounting.view.
+ *
+ * Differences M2 : pas de type d'adresse / bennes / triage, pas d'onglet Information.
+ */
+
+import { formatPhoneFR } from '~/shared/utils/phone'
+import type {
+    ProviderAccountingDraft,
+    ProviderAddressFormDraft,
+    ProviderContactFormDraft,
+    ProviderRibFormDraft,
+} from '~/modules/technique/types/providerForm'
+import type { RefOption } from '~/modules/technique/composables/useProviderReferentials'
+
+/** Reference Hydra embarquee minimale (@id toujours present). */
+export interface HydraRef {
+    '@id': string
+    [key: string]: unknown
+}
+
+/** Une relation peut etre embarquee (objet), un IRI nu (chaine) ou absente. */
+export type Relation = HydraRef | string | null | undefined
+
+/** Site embarque (groupe site:read). */
+export interface SiteRead extends HydraRef {
+    name?: string
+    postalCode?: string
+    color?: string
+}
+
+/** Categorie embarquee (groupe category:read). */
+export interface CategoryRead extends HydraRef {
+    code?: string
+    name?: string
+}
+
+/** Contact embarque (groupe provider:item:read). */
+export interface ContactRead extends HydraRef {
+    id: number
+    firstName?: string | null
+    lastName?: string | null
+    jobTitle?: string | null
+    phonePrimary?: string | null
+    phoneSecondary?: string | null
+    email?: string | null
+}
+
+/** Adresse embarquee (groupe provider:item:read) — version simplifiee M3. */
+export interface AddressRead extends HydraRef {
+    id: number
+    country?: string | null
+    postalCode?: string | null
+    city?: string | null
+    street?: string | null
+    streetComplement?: string | null
+    sites?: SiteRead[]
+    categories?: CategoryRead[]
+    // L'embed M2M des contacts d'adresse peut etre un objet (partiel) ou un IRI nu.
+    contacts?: Array<HydraRef | string>
+}
+
+/** RIB embarque (groupe provider:read:accounting, present ssi accounting.view). */
+export interface RibRead extends HydraRef {
+    id: number
+    label?: string | null
+    bic?: string | null
+    iban?: string | null
+}
+
+/**
+ * Detail d'un prestataire (`GET /api/providers/{id}`). Tous les champs sont
+ * optionnels : skip_null_values + gating accounting peuvent omettre n'importe
+ * quelle cle.
+ */
+export interface ProviderDetail extends HydraRef {
+    id: number
+    companyName?: string | null
+    isArchived?: boolean
+    categories?: CategoryRead[]
+    sites?: SiteRead[]
+    contacts?: ContactRead[]
+    addresses?: AddressRead[]
+    ribs?: RibRead[]
+    // Onglet Comptabilite (present ssi accounting.view)
+    siren?: string | null
+    accountNumber?: string | null
+    nTva?: string | null
+    tvaMode?: Relation
+    paymentDelay?: Relation
+    paymentType?: Relation
+    bank?: Relation
+}
+
+/** Extrait l'IRI d'une relation (objet embarque, IRI nu, ou null si absente). */
+export function iriOf(relation: Relation): string | null {
+    if (relation === null || relation === undefined) {
+        return null
+    }
+    if (typeof relation === 'string') {
+        return relation
+    }
+    return relation['@id'] ?? null
+}
+
+/** IRI des elements d'une collection embarquee (categories / sites du prestataire). */
+export function irisOf(items: HydraRef[] | undefined): string[] {
+    return (items ?? []).map(i => i['@id'])
+}
+
+/** Mappe un contact embarque vers un brouillon (telephones formates XX XX XX XX XX). */
+export function mapContactToDraft(contact: ContactRead): ProviderContactFormDraft {
+    const phoneSecondary = contact.phoneSecondary ?? null
+    return {
+        id: contact.id,
+        iri: contact['@id'] ?? null,
+        firstName: contact.firstName ?? null,
+        lastName: contact.lastName ?? null,
+        jobTitle: contact.jobTitle ?? null,
+        phonePrimary: contact.phonePrimary ? formatPhoneFR(contact.phonePrimary) : null,
+        phoneSecondary: phoneSecondary ? formatPhoneFR(phoneSecondary) : null,
+        email: contact.email ?? null,
+        hasSecondaryPhone: phoneSecondary !== null && phoneSecondary !== '',
+    }
+}
+
+/** Mappe une adresse embarquee vers un brouillon (IRI extraits des sous-collections). */
+export function mapAddressToDraft(address: AddressRead): ProviderAddressFormDraft {
+    return {
+        id: address.id,
+        country: address.country ?? 'France',
+        postalCode: address.postalCode ?? null,
+        city: address.city ?? null,
+        street: address.street ?? null,
+        streetComplement: address.streetComplement ?? null,
+        categoryIris: (address.categories ?? []).map(c => c['@id']),
+        siteIris: (address.sites ?? []).map(s => s['@id']),
+        contactIris: (address.contacts ?? []).map(c => (typeof c === 'string' ? c : c['@id'])),
+    }
+}
+
+/** Mappe un RIB embarque vers un brouillon. */
+export function mapRibToDraft(rib: RibRead): ProviderRibFormDraft {
+    return {
+        id: rib.id,
+        label: rib.label ?? null,
+        bic: rib.bic ?? null,
+        iban: rib.iban ?? null,
+    }
+}
+
+/** Mappe les champs comptables (scalaires + IRI des referentiels embarques). */
+export function mapAccountingDraft(provider: ProviderDetail): ProviderAccountingDraft {
+    return {
+        siren: provider.siren ?? null,
+        accountNumber: provider.accountNumber ?? null,
+        nTva: provider.nTva ?? null,
+        tvaModeIri: iriOf(provider.tvaMode),
+        paymentDelayIri: iriOf(provider.paymentDelay),
+        paymentTypeIri: iriOf(provider.paymentType),
+        bankIri: iriOf(provider.bank),
+    }
+}
+
+/**
+ * Options de categories (value=IRI, label=nom) construites depuis l'embed.
+ * Source role-independante : evite de dependre de `GET /categories` (403 possible
+ * pour un role metier), qui laisserait les libelles vides en consultation.
+ */
+export function categoryOptionsOf(categories: CategoryRead[] | undefined): RefOption[] {
+    return (categories ?? []).map(c => ({
+        value: c['@id'],
+        label: c.name ?? c.code ?? c['@id'],
+    }))
+}
+
+/** Options de sites (value=IRI, label=nom) construites depuis un embed. */
+export function siteOptionsOf(sites: SiteRead[] | undefined): RefOption[] {
+    return (sites ?? []).map(s => ({ value: s['@id'], label: s.name ?? s['@id'] }))
+}
+
+/** Options de contacts (value=IRI, label=nom complet ou email) depuis l'embed prestataire. */
+export function contactOptionsOf(contacts: ContactRead[] | undefined): RefOption[] {
+    return (contacts ?? []).map(c => ({
+        value: c['@id'],
+        label: [c.firstName, c.lastName].filter(Boolean).join(' ') || (c.email ?? c['@id']),
+    }))
+}
+
+/**
+ * Liste a une seule option (ou vide) construite depuis un referentiel embarque
+ * (TvaMode / PaymentDelay / PaymentType / Bank) pour alimenter un MalioSelect en
+ * lecture seule. Le libelle vient de l'embed, jamais d'un GET de referentiel —
+ * l'affichage reste correct quel que soit le role.
+ */
+export function referentialOptionOf(relation: Relation): RefOption[] {
+    if (!relation || typeof relation === 'string') {
+        return []
+    }
+    const label = (relation.label as string | undefined)
+        ?? (relation.name as string | undefined)
+        ?? relation['@id']
+    return [{ value: relation['@id'], label }]
+}
+
+/** Code metier d'un referentiel embarque (PaymentType.code = 'LCR' / 'VIREMENT'), ou null. */
+export function paymentTypeCodeOf(relation: Relation): string | null {
+    if (!relation || typeof relation === 'string') {
+        return null
+    }
+    return (relation.code as string | undefined) ?? null
+}
+
+/**
+ * Bouton « Modifier » : visible si l'utilisateur peut editer au moins un onglet —
+ * `manage` (onglets metier) OU `accounting.manage` (le role Compta doit pouvoir
+ * ouvrir l'edition pour son onglet Comptabilite). Le readonly fin par onglet est
+ * gere sur l'ecran d'edition.
+ */
+export function canEditProvider(canAny: (codes: string[]) => boolean): boolean {
+    return canAny(['technique.providers.manage', 'technique.providers.accounting.manage'])
+}
+
+/** Bouton « Archiver » : permission archive ET prestataire encore actif (Admin seul). */
+export function showArchiveAction(can: (code: string) => boolean, isArchived: boolean): boolean {
+    return can('technique.providers.archive') && !isArchived
+}
+
+/** Bouton « Restaurer » : permission archive ET prestataire deja archive (Admin seul). */
+export function showRestoreAction(can: (code: string) => boolean, isArchived: boolean): boolean {
+    return can('technique.providers.archive') && isArchived
+}