iVend 6.6 8567
When applying an On-Account charge for a customer on iVend Point of Sale, the integrated SAP invoice does not apply the customers configured terms for the Due date on the SAP invoice. It will set the due date to the same as the transaction date making even though the customer has 30-day terms.
Go To: Administration >> System Initialization >> iVend Retail >> Click on Retail Settings.
Make sure the correct "Default Payment Terms for Retail" should update, check below screenshot.