AP INVOICE INTERFACE FOR RTV

At the time of Debit Memo creation for RTV in OREIM, there is no option to change the Payment Terms. And IM_AP_STAGE_HEAD table has Terms Date as Document Date and Best Terms as Payment Terms.But when this Invoice posted to Accounts Payables, AP calculating the Payment Due Date as Terms Date + Payment Terms. But what in case if We need to Pay the supplier on Immediate Terms. In this case OReIM not allows to change the Payment Terms in Debit Memo Screen? There is manual interface created for Oracle Retail to AP, so that need to know what should