diff --git a/src/pages/03_customer-management/form.ts b/src/pages/03_customer-management/form.ts
index e39c5723..036f34c5 100644
--- a/src/pages/03_customer-management/form.ts
+++ b/src/pages/03_customer-management/form.ts
@@ -139,7 +139,8 @@ export const useCustomerForm = defineStore('form-customer', () => {
     currentFormData.value.customerBranch?.push({
       id: '',
       code: '',
-      branchNo: 1,
+      branchNo:
+        (currentFormData.value.customerBranch?.at(-1)?.branchNo || 0) + 1,
       address: '',
       addressEN: '',
       provinceId: '',