How can we map custom Transaction Type of Credit Memo in Subscription Billing Module

Summary

How can we map custom Transaction Type of Credit Memo in Subscription Billing Module

Content

We have two standard Transaction Types in AR for Subscriptions, in our case we couldn't use the same as we are using Document Sequences in Receivables and the support team confirmed that we cannot add Transaction Types starting with ORA in Document Sequences. Hence, we did create custom transaction types one for Invoice and another for Credit Memo.

We did map the custom transaction types to document sequences. I could map the custom transaction type for invoice at Subscription Profile. But where can we map the custom transaction type for credit memo.