ef353a76_ssions_Blogspot__February_2010__Description
[Name] PO Returns (this prevents you from paying for an item that has been returned) [Versions] 7.5, 8.0, 9.0, 10.0 [Price] FREE [Description] 
When invoicing a receipt in POP, this customization will check the previous quantity invoiced and the quantity returned for the line item. The maximum quantity allowed to be invoiced is based the following formula: Quantity Shipped minus (Previous Quantity Invoiced plus Quantity Returned). This customization will not allow invoicing of more than this amount.
Dynamics Confessions Blogspot: February 2010
Description