It only works if you have not previously "completed" the receipt. That's an option that appears when you enter a receipt.

I hope you realize that the receipt/return function in Inventory is rudimentary. If you want full-blown functionality, you need one of the Adagio PO modules, such as Purchase Orders for Adagio (www.stiefgroup.com) or PO Tracker by IMS (www.islandmicro.com).

Steve