Web Service: Response has null value and no exception is thrown

Hi
I have generated a Web Service Proxy in JDeveloper 11gR1 against a web service.
My problem is that if I try to invoke the web service programmatically the only property on the response object has the null value. I can inspect the response in the Http Analyzer and it seems to understand and display content of the response properly.
I have debugged the service proxy and discovered that the set-method on the property is never called. No exceptions are thrown, so it is very hard to see where to start solving this issue!
Any ideas?

When a webservice provides a response that is not valid according to its wsdl, a webservice proxy in 10g will give useful error messages such as "Missing element 'xxx'."
In 11g the web service proxy simply sets non-valid values to null, quietly accepting the invalid response. Is this the intended behavior?
Is it possible to enter a debug mode, where the webservice response is validated against the wsdl as in 10g?
I appreciate any help on this question.
Thanks!

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