      <LI>If there is any missing WSDL metadata
                      as required by this method.
                  <LI>If the <code>endpointReference</code> metadata does
                      not match the <code>serviceName</code> of this
                      <code>Service</code> instance.
                  <LI>If a <code>portName</code> cannot be extracted
                      from the WSDL or <code>endpointReference</code> metadata.
                  <LI>If an invalid
                      <code>endpo