Clientgen not accepting empty messages

I am using clientgen from WL 8.1 sp3.
Given following operation :
<wsdl:operation name="myOp">
<wsdl:input name="input1" message="xx:inputMsg"/>
<wsdl:output name="output1" message="xx:outputMsg"/>
</wsdl:operation>
if inputMsg is empty (i.e. zero parts) but outputMsg is not empty, then clientgen fails with NullPointerExcption
The other three combinations are all succesful, i.e:
inputMsg and outputMsg both empty
inputMsg and outputMsg both not-empty
inputMsg not-empty and outputMsg empty
The wsdl file as a whole is valid according to xmlspy and xmethods.com's wsdl validator, and is conformable to WS-I basic profile 1.0
Regards
Nick Rose

Let me partly answer my own question:
The wsdl in question describes a document-literal style service. It doesn't make much sense to have an empty input message in such a service. On the other hand I am not certain it is specifically incorrect to do so.
However this does not explain why the situation where both input and output messages are empty is allowed acording to clientgen.
any thoughts welcome
/Nick Rose

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