Calling web service from Java "The message with Action '' cannot be processed at the receiver"

I'm newbie with web services and java, so I have some issues to connect my application with an external Web Service. I get all the time this exception

The message with Action '' cannot be processed at the receiver

Maybe my assumptions are wrong, but I think the action is defined inside the SOAP payload. Here is the WSDL:

<?xml version='1.0'?>
<definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://www.tempuri.org/wsdl/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.tempuri.org/wsdl/" xmlns="http://schemas.xmlsoap.org/wsdl/">
  <types />
  <message name="BINICIARREPORTRequest">
    <part name="EAUSUARIO" type="xsd:string" />
    <part name="EAMODULO" type="xsd:string" />
    <part name="EANOMREPOR" type="xsd:string" />
    <part name="EAPARAMREPOR" type="xsd:string" />
    <part name="EANOMPANTA" type="xsd:string" />
  </message>
  <message name="BINICIARREPORTResponse">
    <part name="RESULT" type="xsd:boolean" />
  </message>
  <portType name="PWS_LANZA_REPOR_PORT_1">
    <operation name="BINICIARREPORT">
      <wsdl:documentation xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" />
      <input message="tns:BINICIARREPORTRequest" />
      <output message="tns:BINICIARREPORTResponse" />
    </operation>
  </portType>
  <binding name="PWS_LANZA_REPOR_PORT_1Soap" type="tns:PWS_LANZA_REPOR_PORT_1">
    <soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="rpc" />
    <operation name="BINICIARREPORT">
      <soap:operation soapAction="http://www.tempuri.org/wsdl/BINICIARREPORTRequest" style="rpc" />
      <input name="BINICIARREPORTRequest">
        <soap:body use="encoded" namespace="http://www.tempuri.org/wsdl/" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
      </input>
      <output name="BINICIARREPORTResponse">
        <soap:body use="encoded" namespace="http://www.tempuri.org/wsdl/" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
      </output>
    </operation>
  </binding>
  <service name="PWS_LANZA_REPOR">
    <wsdl:documentation xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" />
    <port name="PWS_LANZA_REPOR_PORT_1Port" binding="tns:PWS_LANZA_REPOR_PORT_1Soap">
      <soap:address location="" />
    </port>
  </service>
</definitions>

Here is the code I'm using:

        final String endpointUrl = this.configuracion
                .getConfigJNDI(WS_MECANIZACION_JNDI);

        final QName serviceName = new QName(null,
                "PWS_LANZA_REPOR");
        final QName portName = new QName(null, "PWS_LANZA_REPOR_PORT_1Port");
        final javax.xml.ws.Service service = javax.xml.ws.Service
                .create(serviceName);
        service.addPort(portName, SOAPBinding.SOAP11HTTP_BINDING,
                endpointUrl);

        final Dispatch<SOAPMessage> dispatch = service.createDispatch(
                portName, SOAPMessage.class,
                javax.xml.ws.Service.Mode.MESSAGE);

        final SOAPMessage response = dispatch.invoke(mensajeSOAP);

If I use SoapUI to check this out, everything works fine (the message is OK as well as the endpointURL), but no success whatsoever from the java application.

This is the soap message I'm sending:

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsdl="s" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <SOAP-ENV:Header/>
    <SOAP-ENV:Body>
        <wsdl:BINICIARREPORT xmlns:wsdl="cosa">
            <EAUSUARIO>CD</EAUSUARIO>
            <EAMODULO>PR</EAMODULO>
            <EANOMREPOR>PRR14</EANOMREPOR>
            <EAPARAMREPOR/>
            <EANOMPANTA/>
        </wsdl:BINICIARREPORT>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

I don't know whether this is important, but the url I was given has no "?wsdl" at then end:

http://prueba/prueba/Pws_Lanza_Rep1.svc

Any clues?