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app/utils/id/po.utill.js

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+/**
+ * Copyright (c) 2026 Niolla
+ * All rights reserved.
+ *
+ * This source code is proprietary and confidential.
+ * Unauthorized copying, modification, distribution, or use
+ * of this file, via any medium, is strictly prohibited.
+ */
+
+// app/utils/id/po.util.js
+
+const { nextSequence, pad } = require("../referenceNumber.util");
+const { sequelize } = require("../../models");
+
+const generatePONumber = async (orderNo) => {
+  const sequenceKey = `PO-${orderNo}`;
+
+  return await sequelize.transaction(async (transaction) => {
+    const nextVendor = await nextSequence(sequenceKey, transaction);
+
+    return `PO/${orderNo}/V${String(nextVendor).padStart(2, "0")}`;
+  });
+};
+
+module.exports = { generatePONumber };