Unique External Reference Number

1. You must provide a unique reference number for two separate sales orders. when you enable this unique external reference number.
2. You will receive a validation here if we provide the same customer [External Refer].

1. By using the same External Refer, create a 2nd order, you will get an error in the sales orders.

Note: You may assign the same External Refer for two different sales orders numbers when you disable the check box on the CommercePro management page.