When you change the web resource XML file, your changes are not reflected until the cached version of the file is updated. By default, the cache is refreshed every 20 minutes. You can force an update in one of three ways:
Click the Refresh Cache button in the Deployment Manager, as described in Refreshing through the Deployment Manager.
Refresh the impacted message processing steps, as described in Refreshing a Step.
Change the cache time, as described in Changing the Cache Time. This method is most useful when repeatedly testing changes.