Country/Region codes are used in connection with INTRASTAT reporting and VIES declarations.
You can assign country/region codes when you set up your vendors or afterward. You must have already set up the relevant country/region codes.
Open the Vendor Card window.
Browse to the card for a vendor that will have a country/region code.
Click the General tab.
In the Country/Region Code field, click the AssistButton .
Select the desired code, and then click OK.
You can change a country/region code for a vendor by inserting a different code from the Countries/Regions window. Changing the country/region code will not affect entries that are already posted.
If you use the facilities for VAT or INTRASTAT reporting, it is important that you assign the correct country/region codes to all vendors in other EU countries/regions.