Thanks Agnieszka. If only it were that simple.
It is possible to supply a customer in Germany from the UK warehouse (this is what happens now as the German warehouse is not yet operational). The German customer's VAT zone is Inside EU. However, the same customer when delivered from the German warehouse is Domestic. It is entirely possible for a business to have warehouses in several countries, where the VAT zone depends both on the location's country and the customer's country.