Hi Mukesh,
Then it may be bug of SAP.
Recently similar cases are occurred in in SAP B1 Version 9.0.
Symptoms:
Quantity in Sales Documets is differ with Quantity and Item posting list / inv Audit report even though Item per sales unit = 1
CoGS for the sales document effects based on inventory posting list Quantity and not based on Quantity in sales Doc
If you are getting results for the below query, then you please approach SAP to help you.
SAP may suggest to upgrade to latest version
SELECT T0.DocEntry, T0.VisOrder, T0.ItemCode, T0.[Quantity], T0.[InvQty] FROM INV1 T0 Where T0.[Quantity]<>T0.[InvQty]
Thanks
Unnikrishnan