How do I set prefix for WSDL paramenter in ES4 form to pass to .net WCF service?

The following is sent in the soap envelope to my WCF service

<soap:Body>

      <tns:AddMFTSurvey xmlns:tns="OlicDemographicV1.0">

         <credential>Wednesday</credential>      ----missing tns prefix

      </tns:AddMFTSurvey>

   </soap:Body>

WCF service is not recognizing the credential parameter because it doesn't have the "tns" prefix in front of the word credential.

Can this be coded in AEM Designer to make it appear?

Any other solutions would be helpful.