Oct 29, 2013 09:12 AM|Siva Krishna Macha|LINK
I could see two possible reasons:
1. Your proxy is not in sync with the service. (i.e., you may need to take the latest wsdl and refresh/regenerate the proxy).
2. getPolicyResponse object has (refers) some billingAccount object in it. It looks like mandatory element but the service has not returned this billingAccount object in the response.
Please mark this as answer if this answers your question.