diff --git a/frontend/modules/logistique/pages/weighing-tickets/[id]/edit.vue b/frontend/modules/logistique/pages/weighing-tickets/[id]/edit.vue
index 1b7085b..4686a8d 100644
--- a/frontend/modules/logistique/pages/weighing-tickets/[id]/edit.vue
+++ b/frontend/modules/logistique/pages/weighing-tickets/[id]/edit.vue
@@ -192,6 +192,7 @@ import { useWeighbridge } from '~/modules/logistique/composables/useWeighbridge'
 import { useWeighingTicket } from '~/modules/logistique/composables/useWeighingTicket'
 import { useWeighingTicketReferentials, type RefOption } from '~/modules/logistique/composables/useWeighingTicketReferentials'
 import { NUMERIC_MASK, PLATE_MASK, FREE_PLATE_MASK } from '~/modules/logistique/utils/weighingMasks'
+import { mapViolationsToRecord } from '~/shared/utils/api'
 
 const { t } = useI18n()
 const api = useApi()
@@ -344,7 +345,13 @@ async function confirmManual(): Promise<void> {
         await saveDraft()
     }
     catch (e) {
-        manualModal.errors = { weight: weighbridge.extractWeighbridgeError(e) }
+        // 422 de pesée (poids/DSD ≤ 0, Assert\Positive) → erreur sous le BON champ
+        // (le propertyPath back `weight`/`dsd` = nom du champ de la modale). Sinon
+        // (503 pont indispo, réseau) → message générique sous le champ Poids.
+        const violations = mapViolationsToRecord((e as { response?: { _data?: unknown } })?.response?._data)
+        manualModal.errors = Object.keys(violations).length > 0
+            ? violations
+            : { weight: weighbridge.extractWeighbridgeError(e) }
     }
     finally {
         manualModal.loading = false
diff --git a/frontend/modules/logistique/pages/weighing-tickets/new.vue b/frontend/modules/logistique/pages/weighing-tickets/new.vue
index defd585..73bb45c 100644
--- a/frontend/modules/logistique/pages/weighing-tickets/new.vue
+++ b/frontend/modules/logistique/pages/weighing-tickets/new.vue
@@ -181,6 +181,7 @@ import { useWeighingTicketForm, type WeighingBlockState } from '~/modules/logist
 import { useWeighbridge } from '~/modules/logistique/composables/useWeighbridge'
 import { useWeighingTicketReferentials, type RefOption } from '~/modules/logistique/composables/useWeighingTicketReferentials'
 import { NUMERIC_MASK, PLATE_MASK, FREE_PLATE_MASK } from '~/modules/logistique/utils/weighingMasks'
+import { mapViolationsToRecord } from '~/shared/utils/api'
 
 const { t } = useI18n()
 const api = useApi()
@@ -309,7 +310,13 @@ async function confirmManual(): Promise<void> {
         await saveDraft()
     }
     catch (error) {
-        manualModal.errors = { weight: weighbridge.extractWeighbridgeError(error) }
+        // 422 de pesée (poids/DSD ≤ 0, Assert\Positive) → erreur sous le BON champ
+        // (le propertyPath back `weight`/`dsd` = nom du champ de la modale). Sinon
+        // (503 pont indispo, réseau) → message générique sous le champ Poids.
+        const violations = mapViolationsToRecord((error as { response?: { _data?: unknown } })?.response?._data)
+        manualModal.errors = Object.keys(violations).length > 0
+            ? violations
+            : { weight: weighbridge.extractWeighbridgeError(error) }
     }
     finally {
         manualModal.loading = false