Credit issued from Service Contracts - fails in AutoInvoice

Service Contract was created from Order Management - all billing for the Original Order and Service Contract is done in Order Management.  NOTE:  When Service Contract was created from Order Management - transaction type was not populated.

Customer wants to cancel their Support on the Service Agreement - user terminates Service Agreement and credit is issued from OKS.  When Service Contracts Main Billing is run - the transaction fails AutoInvoice with the following error:

 

Errors:　　 1) Invalid transaction type id (CUST_TRX_TYPE_ID) ((Null))

　　　　　　　　　　　 2) You must supply payment terms for your non-credit transaction

How can this error be prevented.  Is it possible for OM to pass the transaction type to create credit memo?