Item Tracking Issue When Closing Prod. Orders

Hi all, very new to NAV2009 (just went live last week), and we are having an issue when we are changing some production orders from released to Closed. We are using serial number tracking, but not lot tracking. The message we are getting is “Qty. to handle (Base) in Tracking Specification for item number 123456, Serial Number 20110034, Lot No:, is currently 2, it must be 1.” I look at the item tracking lines on the released Prod order, and sure enough it’s 1. Any help would be appreciated. Hope I got the right forum.