Collective bililng + creating credit memo requests with many sales offices

Hello,

We are using collective billing across different sales offices and do some pricing at sales office level.

Our problem is when we create credit memo requests with reference to invoice. Since the sales office is at header level on DMR the net value will be totally different compared to the invoice value (here sales office is at item level).

Same problems occurs when we create a new correct invoice with reference to original reference using a debet memo request.

Are we able to solve this using standard SAP? Also, can you recommend a possible solutions to our problem?

Kind regards