JBossWS cannot identify element in an RPC/Literal SOAP message within a target namespace

Issue

Given this sample request:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://www.jboss.org/namespace">
  <soapenv:Header/>
  <soapenv:Body>
    <ns1:GetData>
      <ns1:MyMethodParameter>
        ...
      </ns1:MyMethodParameter>
    </ns1:GetData>
  </soapenv:Body>
</soapenv:Envelope>

The following error is thrown in the error log when invoking a webservice call. The element is present in the target namespace but is unable to identify it.

    org.jboss.ws.WSException: Cannot find child element: MyMethodParameter

Note that this is using an RPC-Literal web service binding.