getting overwritten after IS restart


Mediator 9.9 is installed in our environment.
I have changed the following property value in the file file located under SAGHOME/IntegrationServer/instances/default/WmMediator/config/resources directory path

Below steps (as mentioned in Mediator Administration Guide) were followed to make the property value change.

  1. Shutdown the Integration Server
  2. Modified the Integration Server
  3. Restart the Integration Server

But once the Integration Server is restarted, this property is getting overridden with the default value (x-CentraSite-APIKey)
Kindly let me know what can be the issue and how to solve this.

Ilias S