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Estou tendo um problema ao tentar pegar o retorno do WebService.

Utilizei essa documentação para me basear, http://tdn.totvs.com/display/public/fluig/Consumo+de+um+WS+SOAP+de+um+Widget

Porém, fica dando o seguinte erro: Uncaught TypeError: Cannot set property 'innerHTML' of undefined

Segue o código abaixo:

var wsUrl = WCMAPI.serverURL + "/webdesk/ECMDatasetService?wsdl";
            var that = this;
            var wg_cpf = $("#cpf").val();
            var wg_pedido = $("#pedido").val();
            console.log("CPF: " + wg_cpf + " | Pedido: " + wg_pedido);
            // Realiza a chamada Ajax
            var soapRequest = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ws="http://ws.dataservice.ecm.technology.totvs.com/"><soapenv:Header/><soapenv:Body><ws:getDataset><companyId>1</companyId><username>admin</username><password>admin</password><name>ds_consulta_rms</name><fields></fields><constraints><item><contraintType>ContraintType.MUST</contraintType><fieldName>CPF_CLIENTE</fieldName><finalValue>1234567890</finalValue><initialValue>1234567890</initialValue><likeSearch>false</likeSearch></item><item><contraintType>ContraintType.MUST</contraintType><fieldName>PED_NUM_PEDIDO_CP</fieldName><finalValue>123456</finalValue><initialValue>123456</initialValue><likeSearch>false</likeSearch></item></constraints><order></order></ws:getDataset></soapenv:Body></soapenv:Envelope>';

            //Convertendo para XML, para facilitar a manipulação
            var parser = new DOMParser();
            var xmlRequest=parser.parseFromString(soapRequest,"text/xml");

            // Preenchimento das informações para acessar o Dataset
            xmlRequest.getElementsByTagName("companyId")[0].innerHTML = "1";
            xmlRequest.getElementsByTagName("username")[0].innerHTML = "admin";
            xmlRequest.getElementsByTagName("password")[0].innerHTML = "admin";
            xmlRequest.getElementsByTagName("name")[0].innerHTML = "ds_consulta_rms";

            // Valores para os campos
            xmlRequest.getElementsByName("[constraints='fieldName']")[0].innerHTML = "CPF_CLIENTE";
            xmlRequest.getElementsByName("[constraints='finalValue']")[0].innerHTML = "wg_cpf";
            xmlRequest.getElementsByName("[constraints='initialValue']")[0].innerHTML = "wg_cpf";

            xmlRequest.getElementsByName("[constraints='fieldName']")[0].innerHTML = "PED_NUM_PEDIDO_CP";
            xmlRequest.getElementsByName("[constraints='finalValue']")[0].innerHTML = "wg_pedido";
            xmlRequest.getElementsByName("[constraints='initialValue']")[0].innerHTML = "wg_pedido";

            // Acessando o Dataset via WebService
            WCMAPI.Create({
                url : wsUrl,
                contentType : "text/xml",
                dataType : "xml",
                data : xmlRequest,
                success : function(data) {
                    console.log("Carregou o Pedido da Montagem");
                    var xmlResp = parser.parseFromString(data.firstChild.innerHTML,"text/xml");
                    console.log("Documento Publicado: " + xmlResp.getElementsByTagName("documentId")[0].innerHTML);
                    console.log(xmlResp);
                    that.preencherDadosDataset(data);
                }
            });