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Scenario

If you want to make changes only when there is an error condition in an XML message containing error, XmlSlurper Groovy can be used.

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Sample Message

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <soap:Fault>
            <faultcode>
                soap:Server
            </faultcode>
            <faultstring>
                javax.xml.ws.WebServiceException: com.exception.BaseUserException: Some Error.
            </faultstring>
        </soap:Fault>
    </soap:Body>
</soap:Envelope>

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Groovy Script

import groovy.xml.XmlSlurper
import groovy.xml.XmlUtil

var rootNode = new XmlSlurper(false, true).parseText(responseBodyTextFromTargetAPI).declareNamespace('soap':'http://schemas.xmlsoap.org/soap/envelope/')

def element=rootNode.'soap:Body'.'soap:Fault'.'faultstring'

if(element != ''){
  rootNode.'soap:Body'.'soap:Fault'.replaceNode { }
  rootNode.'soap:Body'.appendNode {
    faultstring(element.text())
  }
  responseBodyTextFromTargetAPI = XmlUtil.serialize(rootNode)
}

​
Result

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <faultstring>
            javax.xml.ws.WebServiceException: com.exception.BaseUserException: Some Error.
        </faultstring>
    </soap:Body>
</soap:Envelope>