fix issue and add consolidation

apps/edr-freight-api/src/modules/train-scheduling/services/train-scheduling.service.ts

@@ -6081,6 +6081,18 @@ export class TrainSchedulingService {
       const trainSetWagon = savedWagons[i];
       if (!slot || !trainSetWagon) continue;
 
+      // Last line of defense behind validateWagonCargoExclusivity: a wagon
+      // with bulk on it carries that one load only — never a container and
+      // never a second bulk booking.
+      if (
+        slot.allocations.length > 1 &&
+        slot.allocations.some((a) => a.loadType === AllocationLoadType.Bulk)
+      ) {
+        throw new BadRequestException(
+          `Wagon #${slot.sequenceNo} mixes bulk with other cargo — a wagon carrying bulk takes that one load only`,
+        );
+      }
+
       for (const alloc of slot.allocations) {
         const savedAllocation = await manager.getRepository(WagonBookingAllocation).save(
           manager.getRepository(WagonBookingAllocation).create({