SAP Webservice: Service Consumer

Hello Gurus

I'm trying to call a webservice from SAP. The webservice has been tested with soapUI and it works, only when I try to call the service from SAP I get the following error:

SOAP:1007 SRT: Unsupported xstream found: ("HTTP Code 400 : Bad Request")

The exact same implementation works fine in a different client on the same machine. I can't find any differences and I can't understand why the one client works fine but not in the other one. No ideea where to look further.

Any ideeas?

Regards