Why doesn't SoapClient generate xml?

Question

PHP

When calling a remote method with parameters, an empty xml is created

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://namespace"><SOAP-ENV:Body><ns1:Message/></SOAP-ENV:Body></SOAP-ENV:Envelope>

I tried both $client->Message($params)and through Soap version 1.1 $client->__soapCall('Message', $params)