diff --git a/frontend/composables/useHoursPage.ts b/frontend/composables/useHoursPage.ts
index 6ec531b..6b99f95 100644
--- a/frontend/composables/useHoursPage.ts
+++ b/frontend/composables/useHoursPage.ts
@@ -138,19 +138,17 @@ export const useHoursPage = () => {
     return true
   }
 
-  const canCreateValidationRowFromAbsence = (employeeId: number) => {
+  const canCreateEmptyValidationRow = (employeeId: number) => {
     const row = rows.value[employeeId]
     if (row?.workHourId) return false
+    if (!hasContractAtSelectedDate(employeeId)) return false
     const dayRow = dayContextByEmployeeId.value.get(employeeId)
-    return !!dayRow?.absenceLabel && hasContractAtSelectedDate(employeeId)
+    return !!dayRow?.absenceLabel || is4hContract(employeeId)
   }
 
-  const canCreateSiteValidationRowFromAbsence = (employeeId: number) => {
-    const row = rows.value[employeeId]
-    if (row?.workHourId) return false
-    const dayRow = dayContextByEmployeeId.value.get(employeeId)
-    return !!dayRow?.absenceLabel && hasContractAtSelectedDate(employeeId)
-  }
+  const canCreateValidationRowFromAbsence = (employeeId: number) => canCreateEmptyValidationRow(employeeId)
+
+  const canCreateSiteValidationRowFromAbsence = (employeeId: number) => canCreateEmptyValidationRow(employeeId)
 
   const bulkValidatableEmployeeIds = computed(() => {
     return visibleEmployees.value
@@ -347,6 +345,10 @@ export const useHoursPage = () => {
 
   const isPresenceTracking = (employee: Employee) => employee.contract?.trackingMode === TRACKING_MODES.PRESENCE
   const isTimeTracking = (employee: Employee) => !isPresenceTracking(employee)
+  const is4hContract = (employeeId: number) => {
+    const employee = employees.value.find((e) => e.id === employeeId)
+    return employee?.contract?.weeklyHours === 4
+  }
   const isRowLocked = (employeeId: number) => {
     const row = rows.value[employeeId]
     if (!row) return false
@@ -692,13 +694,8 @@ export const useHoursPage = () => {
     options: { toast?: boolean } = {}
   ) => {
     const row = rows.value[employeeId]
-    const dayRow = dayContextByEmployeeId.value.get(employeeId)
     if (!row?.workHourId && checked) {
-      const employee = employees.value.find((item) => item.id === employeeId)
-      const hasAbsence = !!dayRow?.absenceLabel
-      const canCreateFromAbsence = !!employee && hasAbsence && hasContractAtSelectedDate(employeeId)
-
-      if (canCreateFromAbsence) {
+      if (canCreateEmptyValidationRow(employeeId)) {
         await bulkUpsertWorkHours({
           workDate: selectedDate.value,
           entries: [{
@@ -746,13 +743,8 @@ export const useHoursPage = () => {
     options: { toast?: boolean } = {}
   ) => {
     const row = rows.value[employeeId]
-    const dayRow = dayContextByEmployeeId.value.get(employeeId)
     if (!row?.workHourId && checked) {
-      const employee = employees.value.find((item) => item.id === employeeId)
-      const hasAbsence = !!dayRow?.absenceLabel
-      const canCreateFromAbsence = !!employee && hasAbsence && hasContractAtSelectedDate(employeeId)
-
-      if (canCreateFromAbsence) {
+      if (canCreateEmptyValidationRow(employeeId)) {
         await bulkUpsertWorkHours({
           workDate: selectedDate.value,
           entries: [{
diff --git a/src/State/WorkHourBulkUpsertProcessor.php b/src/State/WorkHourBulkUpsertProcessor.php
index 5c6f9ec..97f447c 100644
--- a/src/State/WorkHourBulkUpsertProcessor.php
+++ b/src/State/WorkHourBulkUpsertProcessor.php
@@ -134,13 +134,15 @@ final readonly class WorkHourBulkUpsertProcessor implements ProcessorInterface
                 continue;
             }
 
+            $is4hContract = 4 === $contract->getWeeklyHours();
+
             if ($this->isEntryEmpty($normalized)) {
                 // Convention choisie: une ligne vide supprime l'enregistrement existant.
                 if ($existing) {
                     $this->entityManager->remove($existing);
                     ++$result->deleted;
-                } elseif (($absenceByEmployeeId[$employeeId] ?? false) === true) {
-                    // Si une absence existe ce jour, on garde une ligne technique pour pouvoir valider la journée.
+                } elseif (($absenceByEmployeeId[$employeeId] ?? false) === true || $is4hContract) {
+                    // Si une absence existe ce jour ou contrat 4h, on garde une ligne technique pour pouvoir valider la journée.
                     $workHour = new WorkHour()
                         ->setEmployee($employee)
                         ->setWorkDate($workDate)