Force grouping rule by Unique Remittance Identifier

Summary:

Is there a way to force grouping rule by Unique Remittance Identifier even if there are some installement corresponding to credit memo ?

Content (please ensure you mask any confidential information):

We would like to group document inside a paymend by group_id. We would like to be sure to deduce a credit memo only to invoices on the same group ID. We tried to use the Unique Remittance Identifier as document grouping rule. But this grouping rule is ignored when an installement corresponds to a credit memo.

We would like to force to use this grouping rule even if some installements correspond to credit memo. Is there any way to answer this requirement ?