DFDM option from Sage KB:
The Qty Completed Today is populated when a Completion Transaction is entered and then cleared when the transaction is posted. If the completion is abnormally cancelled or deleted, this field can be left with a value and the message will occur on the next completion.
Resolution:
1.Expand Modules, Library Master, Utilities, Data File Display and Maintenance
2.Browse to ...\MAS90\MAS_xxx\WOxxx\WO1xxx.soa (where xxx = company code)
3.At Key Scan Field, enter Work Order Number and hit enter
4.Click Edit
5.Enter field 13, and in the Change field enter 0
6.Exit