Groovy - How to automatically modify/set operation test step request

Hello,

I want to automatically change content of a WSDL request of several requests in test steps of a test case. The name of the service changed in the WS I used to test, but the contents still the same.

I add the idea to do this using a groovy test step script to launch manually. In order to reuse it, I created it in a separated TestSuite.

def testCase = testRunner.testCase.testSuite.project.getTestSuiteByName("testSuiteName").getTestCaseByName("testCaseName")
def request, holder

testCase.testStepList.each { step ->
	request = context.expand( '${#[testSuiteName#testCaseName#'+step.name+']#Request}')
	if(request.contains("<soap:serviceNameBefore>")){ 
		request = request.replaceAll("soap:serviceNameBefore>","soap:serviceNameAfter>")
		// At this time, the request is not updated on expected test step
                // I guess I missing something here
	}
}

I don't find the correct method to update request according to the variable I modified (a string with expected request)

Do you have an idea ? Is there another way to do that ?

To help understand, here is the example of what I want to do. Change this request :

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soap="http://XX/">
   <soapenv:Header/>
   <soapenv:Body>
      <soap:serviceNameBefore>
         <request>
            <name>?</name>
            <price>?</price>
         </request>
      </soap:serviceNameBefore>
   </soapenv:Body>
</soapenv:Envelope>

in all test step to that one

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soap="http://XX/">
   <soapenv:Header/>
   <soapenv:Body>
      <soap:serviceNameAfter>
         <request>
            <name>?</name>
            <price>?</price>
         </request>
      </soap:serviceNameAfter>
   </soapenv:Body>
</soapenv:Envelope>