diff --git a/src/Form/Service/Condition/PersonalDataMutabilityCondition.php b/src/Form/Service/Condition/PersonalDataMutabilityCondition.php
index 8bd36e9..6f3cdfd 100644
--- a/src/Form/Service/Condition/PersonalDataMutabilityCondition.php
+++ b/src/Form/Service/Condition/PersonalDataMutabilityCondition.php
@@ -18,6 +18,10 @@ use App\Form\Service\Contract\FieldConditionInterface;
  * FirstParticipantReadOnlyCondition handles agency-based read-only logic for first participant,
  * while this condition applies BPN mutability rules to all participants.
  *
+ * Exception: For internal agency bookings (agency code 0004), the BPN mutability flag
+ * is ignored for all participants. Agency staff need full control over participant data
+ * regardless of BPN's mutability restrictions.
+ *
  * In edit mode, BPN determines mutability based on business rules (e.g., payment status,
  * booking state, etc.). We must respect this flag to prevent users from attempting to
  * modify data that BPN will reject.
@@ -34,6 +38,9 @@ class PersonalDataMutabilityCondition implements FieldConditionInterface
      * that BPN does not allow modifications to this participant's data.
      * When true, personal data fields should be hidden and displayed as static text.
      *
+     * Exception: For internal agency bookings, always returns false to allow
+     * editing all participants regardless of BPN's mutability flag.
+     *
      * @param BookingDto           $bookingDto       The current booking data
      * @param int                  $participantIndex The index of the participant being evaluated
      * @param array<string, mixed> $formData         Current form data (unused)
@@ -42,6 +49,12 @@ class PersonalDataMutabilityCondition implements FieldConditionInterface
      */
     public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
     {
+        // For internal agency bookings, all participants are editable
+        // regardless of BPN's mutability flag
+        if ($bookingDto->isInternalAgencyBooking()) {
+            return false;
+        }
+
         $participant = $bookingDto->getParticipant($participantIndex);
         if (null === $participant) {
             return false;