Hi Norman,
What is the validation error you are getting? Typically a message like "Vendor number 'MARAME' on record 1 is invalid". That might help in identifying the issue.
There is one required field missing in the Header section, 'Hdr-Transaction Type'. This identifies the transaction as an invoice, credit note or debit note. Perhaps you need to include this in your import file.
If you have questions for what fields are required, the Help file has a layout for importing and all the required information. From the main help screen, choose 'Importing and Exporting', then choose the bold link 'Import and Export Format notes'.
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Regards,
Softrak Tech Support