diff --git a/src/pages/03_customer-management/form.ts b/src/pages/03_customer-management/form.ts
index abbff607..6f8c78f4 100644
--- a/src/pages/03_customer-management/form.ts
+++ b/src/pages/03_customer-management/form.ts
@@ -235,7 +235,7 @@ export const useCustomerForm = defineStore('form-customer', () => {
             ? ''
             : currentFormData.value.customerBranch?.[0].branchCode
           : '',
-      codeCustomer: '',
+      codeCustomer: undefined,
 
       legalPersonNo:
         currentFormData.value.customerBranch.length !== 0