FetchXML campos Lookup

function busca_municipio() {var municipio = Xrm.Page.getAttribute("name").getValue();//Xml com os parametro para consultavar fecthXml = '<fetch version="1.0" output-format="xml-platform" mapping="logical" distinct="false">';
    fecthXml += '<entity name="new_municipio">';
    fecthXml += '<attribute name="new_municipioid" />';
    fecthXml += '<attribute name="new_municipioid" />';
    fecthXml += '<attribute name="new_nomemunicipio" />';
    fecthXml += '<attribute name="createdon" />';
    fecthXml += '<order attribute="new_nomemunicipio" descending="false" />';//filtro por Nome do Município
    fecthXml += '<filter type="and">';
    fecthXml += '<condition attribute="new_municipioid" operator="eq" value="' + municipio + '" />';
    fecthXml += '</filter>';
    fecthXml += '</entity>';
    fecthXml += '</fetch>';var Xml = "<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">"
    Xml += GenerateAuthenticationHeader()
    Xml += "<soap:Body>";
    Xml += "<Fetch xmlns=\"http://schemas.microsoft.com/crm/2007/WebServices\">";
    Xml += "<fetchXml>";
    Xml += FetchEncode(Xml);
    Xml += "</fetchXml>";
    Xml += "</Fetch>";
    Xml += "</soap:Body>";
    Xml += "</soap:Envelope>";var XmlHttp = CreateXmlHttpObject();
    XmlHttp.open("POST", "/mscrmservices/2007/crmservice.asmx", false);
    XmlHttp.setRequestHeader("SOAPAction", "http://schemas.microsoft.com/crm/2007/WebServices/Fetch");
    XmlHttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    XmlHttp.setRequestHeader("Content-Length", Xml.length);
    XmlHttp.send(Xml);var resultXml = xmlHttpRequest.responseXML;var id = resultXml.selectSingleNode('./id').text;
    alert(id[0].text);
}