CPI: Parse data from SOAP xml response and forward to content modifier

I have two parts of this question.

Response data received from the SOAP request:

<ns:dataTransferResponsePart xmlns:ns="http://xxxxxxxxxxx.xxxx.xxx" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><responseData><formattedData><textData>Object ID
2019-01-09_R1JKES00000001
2019-04-22_R1JKTS00000040
</textData></formattedData></responseData></ns:dataTransferResponsePart>

The use case is to fetch the text content from the above response data tab of <textData>

Part 1:

One is to parse data from a SOAP based XML response and content from specific tag from the response.

I tried with multiple ways but that was snot successful. I tried creating Exchange property in the content modifier to forward the data by Xpath as follows,

value is given as : /ns:dataTransferResponsePart/responseData/formattedData/textData

I have tried the /ns: namespace to specify in the Namespace Mapping, However this didn't allowed to add as this namespace is used for other source.

part 2:

After giving up on the above approach, I tried with groovy script to parse the xml content and fetch the data from the tag as follows:

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
import groovy.util.XmlSlurper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
def Message processData(Message message) {
    Logger log = LoggerFactory.getLogger(this.getClass());
    try {
        def body = message.getBody(java.lang.String) as String;
        def downloadResponse = new XmlSlurper().parseText(body);
        def download_data = downloadResponse.ns:dataTransferResponsePart.responseData.formattedData.textData.text();
        message.setData(download_data);
    } catch (Exception ex) {
       log.error("processData error",ex);
    }
    return message;
}

Any help on the parsing and setting the data to message in the body is much appriciated.