How to modify received and rejected quantities of shipment receipts?

[Christian Carlow]

Is there a way to modify the received and rejected quantities associated 
with shipment receipts?  The company may receive pieces from the 
supplier on one day but determine that some should be rejected on a 
later date.  The company tracks supplier delivery dates so the shipment 
receipt cannot be created on the date when the pieces are rejected 
because the shipment received date would be considered incorrect.

I thought that the InventoryItem Physical Inventory Variance form would 
handle this functionality but it doesn't seem sufficient because it 
doesn't update the rejected quantity of the shipment receipt.  Has 
anyone else encountered this problem?