Got it working now!
I checked that again and found that on this level I have to add 'all the zones' again. More specifically, in German: 'alle Länder' and 'alle Zonen/Bundesländer'.Start with going to the Locations / Taxes ... Zones Definitions ... and find your Zone Definition ...
On this Zone Definition you have a DETAILS button ...
When you click the DETAILS button you should have listed the
Country:
Zone:
for this definition ...
You cannot tax the entire world ... so you would build a Zone for who you do tax ...
Thanks for your help.
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