Hello John,
It's possible to set it up but as far as I know automatic transmission and handling is not possible.
We have set it up in a way that the VAT ID of the customer becomes an order metafield when an order is placed.
This VAT ID needs to be connected with a
workflow in
Wawi that updates the customer's VAT ID on JTL Wawi order - you also need to change the handling of taxes (VAT Exempt) for the order through a workflow.
A developer built such a setup for us in a couple of hours.