A vendor has 2 PO's in SAP. On PO A, incorrect amounts(over payments) were GR'ed(Service Entries are being used) and IR'ed. And these amounts were paid to the vendor.
Vendor invoiced less on PO B to counter the overpayment. These invoices(with the lower amounts were GR'ed and IR'ed on PO B). The IR with the lower amount was then canceled and recreated with the full amount expected on the invoice for PO B. Credit was passed on PO A to reflect the rebate for the overpayment. This corrected the balance of the Vendor.
But now PO A has incorrect GR and IR amounts. IR document cannot be reversed with MR8M as items are already cleared.
What process should be followed to fix PO A?