Hi Lance,
When importing Purchase Orders, the vendor number cannot be set as a Default value - it has to be part of the Import Field Selection list. Whether you are wanting to choose a Sundry or AP vendor, you would get an error attempting to use or save an import template with the vendor number on the Field Defaults tab.
The solution is put the sundry vendor number into the file you want to import.
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Regards,
Softrak Tech Support