fix: allow updating room assignments in edit mode

src/Form/Model/ParticipantEditDto.php

@@ -132,6 +132,11 @@ class ParticipantEditDto
     #[Assert\Callback(groups: ['booking_create', 'booking_edit'])]
     public function validateEmailUniqueness(ExecutionContextInterface $context): void
     {
+        // Skip for internal agency bookings — staff use shared placeholder emails
+        if ($this->bookingContext->isInternalAgencyBooking()) {
+            return;
+        }
+
         // Skip validation for applicant (index 0) - applicant's email can be shared with dependents
         if (true === $this->participant->isApplicant()) {
             return;

src/Form/Service/Condition/AccommodationMutabilityCondition.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Condition;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Contract\FieldConditionInterface;
+
+/**
+ * Condition that checks if accommodation (room assignments) are mutable in the edit flow.
+ */
+class AccommodationMutabilityCondition implements FieldConditionInterface
+{
+    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
+    {
+        return false === $bookingDto->travel->roomsMutable;
+    }
+
+    public function getDependentFields(): array
+    {
+        return [];
+    }
+
+    public function getDescription(): string
+    {
+        return 'Accommodation is not mutable (edit flow)';
+    }
+}

src/Form/Service/EditFieldStateProvider.php

@@ -5,11 +5,10 @@ declare(strict_types=1);
 namespace App\Form\Service;
 
 use App\BusProNet\Utility\DirectionMapper;
-use App\Form\Model\BookingDto;
 use App\Form\Service\Abstract\AbstractFieldStateProvider;
+use App\Form\Service\Condition\AccommodationMutabilityCondition;
 use App\Form\Service\Condition\AdditionalServicesMutabilityCondition;
 use App\Form\Service\Condition\AgeRangeCondition;
-use App\Form\Service\Condition\BookingModeCondition;
 use App\Form\Service\Condition\CompositeCondition;
 use App\Form\Service\Condition\DateOfBirthProvidedCondition;
 use App\Form\Service\Condition\FieldValueCondition;
@@ -99,10 +98,10 @@ class EditFieldStateProvider extends AbstractFieldStateProvider
             'static_text' => $personalDataHiddenCondition,
         ];
 
-        // Room assignments are fixed in edit mode - always render as static text
-        // The assignedRoomId value passes through unchanged from the loaded booking data
+        // Room assignments are readonly when BPN indicates accommodation is not mutable
+        $accommodationMutabilityCondition = new AccommodationMutabilityCondition();
         $this->fieldStateConditions['assignedRoomId'] = [
-            'static_text' => new BookingModeCondition(BookingDto::MODE_EDIT),
+            'static_text' => $accommodationMutabilityCondition,
         ];
 
         // Show remarks room field only when room with code 'mbz' (single bed) is selected

src/Form/Service/ParticipantAssignedRoomFieldHandler.php

@@ -122,7 +122,14 @@ class ParticipantAssignedRoomFieldHandler extends AbstractParticipantFieldHandle
         }
 
         // Calculate total capacity for this room type
-        $totalCapacity = $roomSelection->quantity * $roomSelection->capacity;
+        // In edit mode, use maxQuantity which includes available rooms beyond the booked count.
+        // In create mode, use quantity which is the user's room selection from step 1.
+        if (BookingDto::MODE_EDIT === $bookingDto->getMode()) {
+            $effectiveQuantity = $roomSelection->maxQuantity;
+        } else {
+            $effectiveQuantity = $roomSelection->quantity ?? 0;
+        }
+        $totalCapacity = $effectiveQuantity * $roomSelection->capacity;
 
         // Count current occupancy (excluding current participant)
         $occupancy = 0;
@@ -174,7 +181,12 @@ class ParticipantAssignedRoomFieldHandler extends AbstractParticipantFieldHandle
             return; // Shouldn't happen
         }
 
-        $totalCapacity = $roomSelection->quantity * $roomSelection->capacity;
+        if (BookingDto::MODE_EDIT === $bookingDto->getMode()) {
+            $effectiveQuantity = $roomSelection->maxQuantity;
+        } else {
+            $effectiveQuantity = $roomSelection->quantity ?? 0;
+        }
+        $totalCapacity = $effectiveQuantity * $roomSelection->capacity;
         $currentOccupancy = count($participantsWithRoom);
         $spacesNeeded = ($currentOccupancy + 1) - $totalCapacity;