Upon entering a VAT number and other details under
Top > Billing Director > Taxation Manager > Setup the following error emerges
Tax exemption code is invalid for Netherlands
VAT number was entered incorrectly
Please make sure that the code you are entering is correct.
Netherlands VAT consists of "NL" country code, 9 digits and three characters between B01 and B99, like "NL123456789B01", for details please check the Dutch government website.