Hi
Pl check whether you have in your system the following.
In in t.code OMRM in the area M8 Invoice Verification/Valuation
MSG No 504 Quantity Invoiced greater than Goods receipt Quantity
Online Batch Standard
E E W
Area M8, MSG No 087 Invoice quantity greater than PO quantity (item without GR)
Online Batch Standard
E E W
Regds