Thanks, @AlnoorCassim! But actually I appear to have a workaround. I was attempting to populate UDF data in that file for thousands of records but I didn't have the Pricing Type field data - so I just did a File Assign which appeared to work fine upon ""testing"" but not when running the actual import. However, if I include the Pricing Type data, the import works. So I'm doing a VLOOKUP-type function in Excel to look up the vendor #, product line, and item code - to return the pricing type:
=INDEX($A$2:$E$44933,MATCH(B2&C2&D2,$B$2:$B$44933&$D$2:$D$44933&$E$2:$E$44933,0),3)