How to use setNodeValue in SOAPUI to update XML request - groovy

Question

I'm new to SOAPUI and have several simple XML requests chained together. I want to use Groovy script to update an existing node on the Request side.
For example, I have GetRefData that starts:
<soapenv:Envelope xmlns:soapenv="aaa" xmlns:abc="bbb">
<soapenv:Header>
<abc:RequestHeader>
<CountryCode>US</CountryCode>
<MsgType>GetRefRq</MsgType>
</abc:RequestHeader>
</soapenv:Header>
etc...
I read the responses with no issues:
def GetRequestID = context.expand( '${GetRefData#Response#declare namespace abc=\'bbb\'; //abc:GetRefRq/MsgRqHeader/RequestId[1]}' )
How do I update the RequestId on the initial Request from 12345 to 53421? I've tried:
def groovyUtils = new com.eviware.soapui.support.GroovyUtils(context);
def request = context.expand('GetRefData#Request');
def requestHolder = groovyUtils.getXmlHolder(request);
requestHolder.namespaces["abc"] = "bbb";
def mypath = "//abc:GetRefRq/MsgRqHeader/RequestId[1]"
requestHolder.setNodeValue( mypath, "54321" )
But when I run it, although I get no errors and no updates.
Can someone please point this noob in the correct direction?

Answer 1

Try this :)
def groovyUtils = new com.eviware.soapui.support.GroovyUtils(context);
def request = context.expand('GetRefData#Request');
def requestHolder = groovyUtils.getXmlHolder(request);
//namespace declaration
// assuming your node is <bbb:RequestId>12345</bbb:RequestId>
def ns = "bbb"
requestHolder.setNodeValue("//"+ns+":RequestId", "54321" )
//to verify
log.info requestHolder.getNodeValue("//ns:RequestId" )