Promotion with absolute discount having VAT issue

Hi, when creating a promotion a with absolute discount (lets say 20 euro) works fine when your customers pays taxes and the 20 euro is including VAT. But when a customer does not pay taxes (having a valid EU VAT nr and you ship outside your country) then all prices are exclusive VAT. But the 20 euro absolute discount is not formatted to ex VAT and is still 20 euro discount but now ex VAT. I tried making another promotion for ex VAT customers, but it seems there is no way in the rule-builder to find a matching condition for these ex VAT customers? The solutions should be that you can specify if the absolute discount is ex or in VAT in my opinion.

Am I missing something or is this a bug/ feature request? Any suggestions?

Version 6.4.20.0 self-hosted, professional version.