How can I default Payment Terms on an RMA?

Hello,

I am attempting to setup RMA for a CRR (Credit and Receive Item).  When I generate the OM for the receipt, there is no PTC (Payment Terms Code) for any customer and an error is generated because we have removed the blank record from the UDC.  We don't want to create the Supplier Master for all of our customers just to allow the PTC to be set.

Is there a way to default a value into the Purchasing OM OTC field so that the RMA will generate a valid OM Record?

Thanks.