Hello again,
I just found some information, which partially answers my question [:)] .
The adapter pack comes with an ADO layer to connect to an SAP system, which can be used to extract data with SSIS.
That are the good news for now. Still I’m not sure if it’s possible to do it directly with BizTalk.
Regarding the SSIS, there is a new question: It is possible to install the adapter pack on an Windows Server 2k3 or 2k8 without having the BizTalk installed on this machine?
Cheers!