CM is not selected when PPR is created for multiple supplier sites

Questions is related to Oracle Payments.

We have a requirement to pay for multiple supplier sites of the same supplier using single supplier site. We have defined relationship between supplier sites i.e we have assigned single supplier site as Remit To supplier site for all the other sites of the same supplier. When we enter PPR for given supplier, during invoice selection Oracle calculates balance for each supplier site separately and hence some of the credit memos are not selected in the PPR.

For example:

Supplier ABC

Supplier Site1 - Remit To Supplier Site 3

Supplier Site2 - Remit To Supplier Site 3