The WSDL for the WSTX service bindings employs the invalid attribute "message" for the binding:operation:input and binding:operation:output elements. The correct attribute name is "name". e.g. in wscoor-activation-binding.wsdl the declaration is

<wsdl:binding name="Activation_SOAPBinding" type="wscoor:ActivationPortType">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="CreateCoordinationContextOperation">
<wsdl:input message="wscoor:CreateCoordinationContext">
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output message="wscoor:CreateCoordinationContextResponse">
<soap:body use="literal"/>
</wsdl:output>
</wsdl:operation>
</wsdl:binding>

The correct version should be

<wsdl:binding name="Activation_SOAPBinding" type="wscoor:ActivationPortType">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="CreateCoordinationContextOperation">
<wsdl:input name="wscoor:CreateCoordinationContext">
<soap:body use="literal"/>
</wsdl:input>
<wsdl:output name="wscoor:CreateCoordinationContextResponse">
<soap:body use="literal"/>
</wsdl:output>
</wsdl:operation>
</wsdl:binding>

According to a comment in the flle this was a workaround for an error in the com.ibm.wsdl parsing which now appears to have been fixed. The WSDL should be updated accordingly.