Subscription to AR Service Mapping not working for On Account Credit Memos

The mapping and algorithm works fine for invoices and credit memos (applied to the invoice) but the information is not getting passed to AR for On Account Credit Memos.

If anyone has faced this issue before, please provide your inputs. I am trying to pass the same fields information from SM to AR for Invoices, Credit Memos and On Account Credit Memos. It works for Invoices and Credit Memos (applied to the invoice) but not for On Account Credit Memos.