DMRs and Debit Memo GL coding

Hi
When we input a debit memo against a DMR, the location on the GL code that populates does not match the location for the DMR.
We are a multi-site operation. DMRs are site driven, so I find it strange that this is one place in the software that our AP must remember to override the defaulted GL on the line entry. The location defaults to the location she is entering AP from. The software works as I expect for AP entry on PO receipts. When she enters an invoice against a PO receiver, the correct location is debited for the transaction.
Is this functioning as expected? Is she expected to switch sites for every debit memo? Or do we have a basic setup problem missing somewhere? We no longer have Finance core members. This has happened since day 1.
Scott