Dispute Case creation (credit memo reference to Billing invoice)

Hey

We are using SD module to create Billing invoices and Credit Memo's.

1. Dispute case created for Accounting invoice (Generated from Billing invoice).

2 Credit memo raised in reference to billing invoice and FI document generated for Credit memo.

We are in need to add Credit memo to the existing Dispute case in the Billing invoice.

I have tested this scenario and this is not an standard. Any inputs in this regard is highly appreciated.

Thanks

Rajanikanth.