[SOLVED] How can I change the data source configuration with Groovy?

    dsTestSteps = testCase.getTestStepsOfType( com.eviware.soapui.impl.wsdl.teststeps.WsdlDataSourceTestStep.class )  //only WsdlTestRequest steps
  dsTestSteps.each
   {
     
    log.info it.getDataSourceStepConfig().getDataSource().getType()
    if(it.getDataSourceStepConfig().getDataSource().getType().equals("JDBC")) 
    {
    log.info "test step :"+it.name
    
    /*attempt 2: read-only - this didn't work, either"
    it.getDataSource().properties.each
    {
     if(it.getKey().indexOf("connectionString")!=-1)
     log.info it.getKey()+":"+it.getValue()
     
    }
    def oldbd=it.getDataSource()
    oldbd.properties["connectionString"].value= db*/

    //attempt 1 : configuration it not loaded,even if changed
    def conf=it.getDataSourceStepConfig().getDataSource()
 log.info "conf:"+ conf
 def holder = groovyUtils.getXmlHolder(conf.toString().replace("con:","").replace("-fragment",""))
 log.info holder.getPrettyXml()
 
 def search='//configuration/connstr' 
   c = holder.getDomNode(search)
   
   log.info "1:"+c
   assert c != null,"node not found"
   holder.setNodeValue(search,db)
   c = holder.getDomNode(search)
   log.info "2:"+c
   conf=holder.getXmlObject()
   log.info "connection string:"+conf
    it.getDataSourceStepConfig().getDataSource().setConfiguration(conf)
    
    conf=it.getDataSourceStepConfig().getDataSource()
 log.info "conf final:"+ conf
 
    }
    
   }