Sage 500

Trying to run Schedule Generation for the first time and i'm getting a few errors. it was going through the steps and stopped at a work order. gave an "Error 5 occurred at frmmfzmn001 in Procedure cmdGenerateSched_Click. Invalid procedure call or argument…

Trying to post a Goods Receipt and get this message during matching. What would cause this?

I've got an item showing QtyOnWO as -42, but don't have any open WOs or pending transactions. I seem to remember that there was a SQL SP to clean up this kind of situation. Any suggestions? thanks