Hi,
as I said, if you are using SAP CRM then you can use Channel Sales Management for it:
Ship-and-Debit Claim - Channel Sales Management for High Tech - SAP Library
If you want to implement this process on top of SAP ERP - please check out the offering of our partner Vistex:
Paybacks & Chargebacks | Vistex, Inc
What type of company do you want to implement this in?
Regards, Ulf.