A invalid country error occurs when trying to calculate in Sage 100. This can happen if the country in Sage 100 is listed as "JAP", for example.
The country codes used must the two character ISO codes. The AvaTax service is not able to recognize the three character versions (except for "USA"). To make the two character versions available in Sage 100, you will need to be logged-in as an Admin.
- Go to Modules->Library Master->Setup
- Click on Country Code Maintenacne
- Add the two character ISO codes where applicable
- Modify the customer address(es) that caused the error to use the new two character ISO code version