Hi - it is looking for a date in the primary string [ SO5$ ] , that is probably NG. and possibly doing some date math on it .....
Look at or around position 280, where the date is stored with the year packed, followed by MMDD
hopefully you can use data file display and maintenance to look at some good invoices and compare to the bad one.
Something to do with "Warranty" ... ?
Good Luck
Jeff F
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Jeff Fiddelman
Exeplex, LLC
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