What interface are you talking about? We have looked into this as well, and found that only one product is supposedly SAP certified - Axalant by Eigner&Partner. We had a full-fledged demo onsite sometime back. Is this the one you are referring to?
I would be incredibly interested to know what you find out, and conversely I can give you information that I have as well. Maybe even a phone conversation if you have a moment or two.
Recneps