servicestack webservice testing with SOAPUI

I have created a service using Service Stack and would like to test it using SOAPUI. When I setup the SOAPUI project with the soap12 wsdl url [http://<developmenturl>/soap12], I keep getting the below error :

Mon Mar 13 15:14:29 GMT 2013:ERROR:Could not find element [{http://schemas.servicestack.net/types}<requestDTOobject>] specified in part [parameters]

Initially I had the DTO under a different name space, due to the above error message I changed the DTO object to be in the same namespace as the service but still I get this error.

I have pasted below the request generated:

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:typ="http://schemas.servicestack.net/types">
   <soap:Header/>
   <soap:Body>
      <typ:requestDTOtype/>
   </soap:Body>
</soap:Envelope>

Any help will be much appreciated..

It doesn't appear that SOAPUI is generating the correct request for ServiceStack. ServiceStack creates samples of the Soap1.2 requests and they can be found in metadata page (eg. http://<developmenturl>/metadata). To find the request for your 'Operation' click the SOAP 1.2 link to the right of it on the metadata page. You should be able to copy/replace this request into left pane of the SOAPUI request window.

Sample of the HelloWorld SOAP 1.2 request

<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
    <soap12:Body>

<HelloText xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/HelloWorld">
  <Name>String</Name>
</HelloText>

    </soap12:Body>
</soap12:Envelope>