fix issue

apps/edr-freight-api/src/modules/contracts/contracts.service.ts

@@ -13,7 +13,9 @@ import { YardCountry } from '@edr/types';
 //
 import { deriveTradeDirection } from '../../common/derive-trade-direction.util';
 import { CompaniesService } from '../companies/companies.service';
+import { CargoType } from '../rule-engine/entities/cargo-type.entity';
 import { ServiceType } from '../rule-engine/entities/service-type.entity';
+import { bulkTonsPerWagon } from '../train-scheduling/train-capacity.util';
 import { Yard } from '../rule-engine/entities/yard.entity';
 import { FilesService } from '../files/files.service';
 import { MinioService } from '../minio/minio.service';
@@ -858,6 +860,29 @@ export class ContractsService {
       );
     }
 
+    // NUMBER_OF_WAGONS booking forms need the heaviest load one wagon may take
+    // so they can reject a wagon count whose even share overloads a wagon —
+    // the client-side twin of ContractBookingService.assertWagonShareFits.
+    // The raw wagonTypes join rows are dropped: only the derived cap ships.
+    for (const scope of contract.cargoScope ?? []) {
+      const cargoType = scope.cargoType as
+        | (CargoType & { maxTonsPerWagon?: number | null })
+        | null
+        | undefined;
+      if (!cargoType) continue;
+      const allowed = (cargoType.wagonTypes ?? []).filter(
+        (wt) => Number(wt.capacityTons) > 0,
+      );
+      cargoType.maxTonsPerWagon = allowed.length
+        ? Math.max(
+            ...allowed.map((wt) =>
+              bulkTonsPerWagon(cargoType, wt.id, Number(wt.capacityTons)),
+            ),
+          )
+        : null;
+      delete cargoType.wagonTypes;
+    }
+
     // Surface the staff "request changes" note so the portal can show the
     // customer what to fix. Degrade to null on lookup failure — a missing note
     // must never 500 a contract fetch.