Hey Raf, guess it's because we are a UNIX shop for our SAP systems, and as such, no DBCON drivers are possible for such a MSSQL connection but yes if your SAP BW System is ona Windows or Linux OS, it is possible. Wish we weren't UNIX!
http://service.sap.com/sap/support/notes/1601608
Also, UDConnect has been very troublesome for us, so we avoid it, and I don't even know if that's an OpenHub Destination candidate or not.