Sabrix claims it is the only vendor interfacing with SAP for VAT computation but I don't see how it gets interfaced as the Tax Interface System (TIS) mentions only Sales & Use.
1. Is there another/new entry point with SAP for real-time VAT determination or is TIS used ?
2. Also what are the benefits of using a third-party package over SAP own solutions for VAT (country-versions) ?
3. Is it worth the cost ?