The solution have been already created by the IBM Software Services in the US, specifically the Rational team, if you can get in touch with this team they can help you to deliver the specific solution that you need.

Hi to everyone:
I have a Remedy service (http://10.51.242.52/WsCAP-R/wsConParadigmRemedy.asmx?WSDL) where there are 6 operations, I´m only want to use one operation where I send a Remedy number and receive a detail of that Remedy number, I have created to new attributes to the defect work item, one the number and the other the description, inside the dojo script I extract the number from the defect work item to send that to the service, at this time I´m stuck to create the request for the service, this is the code:

dojo.provide("com.acme.providers.script.DetalleIncidenteScripted");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");
dojo.require("dojox.xml.parser");

(function()
{
    var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;
    var StrNumeroIncidente = "0";//get number value
    var StrProveedor = "XXXXXXX";
    var StrPwd = "XXXXXXXX";
    var scriptname = "DetalleIncidenteScripted";
    var StrDetalle = new String("No se encontro detalle del Numero de Incidente. Favor de revisar el numero del incidente.");
    var StrServiceURL = "http://10.51.242.52/WsCAP-R/wsConParadigmRemedy.asmx?WSDL"; //service to invoke

    dojo.declare("com.acme.providers.script.DetalleIncidenteScripted", null,
    {
        getValue: function(attribute, workItem, configuration)
        {
            console.log(scriptname + " - Inicio js DetalleIncidenteScripted");
            StrNumeroIncidente = workItem.getValue("numeroIncidenteRemedy");
            console.log(scriptname + " Numero de Incidente Remedy: " + StrNumeroIncidente);
           
            if(StrNumeroIncidente==null || StrNumeroIncidente=="0") //validate the Remedy number
            {
                console.log(scriptname + " Numero incidente vacio");
                return StrDetalle;
            }
            else
            {
                console.log(scriptname + " Iniciando llamada a webservice");
                var soapMessage = new String(); // this is where I create the request with all the parameters

                if(window.XMLHttpRequest)//I don´t know if this will work, this is where I´m stuck
                {
                    httpRequest=new XMLHttpRequest();
                } else if (window.ActiveXObject)
                {
                    httpRequest=new ActiveXObject("Microsoft.XMLHTTP");
                }
                 
                httpRequest.open("POST",url,true);
               
                if (httpRequest.overrideMimeType)
                {
                    httpRequest.overrideMimeType("text/xml");
                }
               
                httpRequest.onreadystatechange=populateResponse;
                httpRequest.setRequestHeader("Man", url + " HTTP/1.1")
                httpRequest.setRequestHeader("MessageType", "CALL");
                httpRequest.setRequestHeader("Content-Type", "text/xml");
                httpRequest.send(soapMessage);
                valTimeout=setTimeout("timeout(httpRequest);",120000);
                return service.DetalleReporte.callService("DetalleReporte", StrNumeroIncidente, StrProveedor, StrPwd);//this is the call to the service, DetalleReporte is the operation that I will use
            }     
        }
    });
})();

I hope you can help me with this.
Regards