Hi Charlie,
How do we change the WSDL style? Do you mean the WSDL provider needs to change and regenerate the WSDL again?
I have got a WSDL generated by a non-SAP system and using that WSDL, I created the proxy. When i execute the proxy, the target system receives my message and they respond back with some response. However I get the same error message (exception) that is discussed in this thread.