We are going to start sending VAT Tax data from 2 different Tax Union to the German Tax Authority through our single PI Instance using the Elster Interface. Has anyone had experience in setting this up? We are looking for suggestions on how best to do this. We want to learn from past issues and avoid re-creating the wheel.
The concerns revolve around setting up PI to properly receive the "OK" message from the the Tax Authority and getting it routed back to the proper ECC system.