Identifying the EU Countries 

The fields for VAT processing in the EU are only needed if the company code country and the country of the business partner are member states of the EU. For this reason, every EU country must be indicated as such.

There are also check rules defined in the system which the system uses to recognize an incorrectly entered VAT registration number. For every country, you also enter the ISO code for the EC sales list and a numeric country key for the Intrastat declaration.