Thank you! That acutally helps do the trick. I do have a list of the WSDL as well as the API documentation and I am calling it correctly, but the SOAP trace shows me this:

SOAP::Transport::HTTP::Client::send_receive: HTTP/1.1 405 (Method Not 
+Allowed) Method not allowed
[download]

The information there gives me a lot to go on in the full trace.
Also sorry for the late reply to your message.

Akira