Inventory Management: Goods Receipt Reversal for GR-Based Invoice Verification
Description
As of Release 3.0, you can set in Customizing whether, with goods-receipt based invoice verification, a goods receipt reversal or a return delivery is possible if the invoice has already been posted for the goods receipt document.
Change system parameters in customizing
See the Implementation Guide for Inventory Management under Transactions
-> Goods receipt -> 
For
GR-based IV, reversal of GR despite invoice .
Changes in procedure
If a reversal or return delivery is not allowed, you must cancel the invoice before you enter the GR reversal or the return delivery.
If a reversal is allowed, you can post the material document and cancel the invoice at a later time. If you do not wish to cancel the invoice, you can enter the next goods receipt with reference to the reversal document (reversal or return delivery for reversal document), so that the reference to the invoice continues to exist.