Consuming UPS Signature Tracking Webservice

Hi,

I would like to consume the UPS Signature Tracking Webservice. But when I try to generate the proxy the system says:

"Proxy-Generierung abgebrochen: Message muß genau einen Part haben"

When I take a look at the WSDL the system is right. There are a couple of parts defined. Did someone manage to consume this server?

Thanks, Vanessa