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src/store/shipment/create.js

@@ -1,6 +1,7 @@
 import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
 import taxEnsure from '../tax/ensure.js';
 import { insertLines, parseDate } from '../manifestLines.js';
+import { assertUniqueManifestNumber } from '../manifestDoc/helpers.js';
 import makeRunner from '../runner.js';
 import { loadShipment, queriesFor } from './helpers.js';
 import { syncOrderSummary } from '../order/syncSummary.js';
@@ -212,6 +213,13 @@ export default function create(provider) {
       const nextY = Math.max(existingShipments.length + 1, maxY + 1);
       const shipmentNumber = `${order.number}${shipmentPrefix}${nextY}`;
 
+      await assertUniqueManifestNumber(runner, {
+        companyId,
+        type: 'shipment',
+        number: shipmentNumber,
+        errorMessage: 'Shipment number already exists',
+      });
+
       // 7. Create shipment manifest header
       const createdRes = await runner.query(q.CREATE_MANIFEST, {
         companyId,