Inventory Management - on inquiry screen, amount on PO for a sku is incorrect

Sage 100 c - We noticed on an inventory item in inventory inquiry that the amount on PO was incorrect...meaning that when we looked at the open POs for this item, they totaled 7 on order, but the inquiry screen is showing 24 on order. In the past in MAS200, we would experience this and it was caused by someone cancelling the order and a record would hang up.   More than likely, this is the same reason.  

my question is:   how can I find out that "ghost" PO?   I did recall there was a task that would be ran and the output would indicate the source of the "ghost" po.   Is there a task that will do this in Sage 100? I am also concerned that there may be other skus on the "ghost" PO that are affected.

Terran