Can I disable the warning message that’s displayed when a user changes an expense template?

No. However, you can modify the message to suit your business requirements:

1. In the Setup and Maintenance work area, go to the Manage Messages task.
2. On the Manage Messages page, enter EXM_ERECP_CHANGE_TEMPLATE in the Message Name field and click Search.
3. In the Search Results section, select the message and click the Edit icon.
4. On the Edit Message page, modify the existing details per your requirement.
   Note: Don't edit the message number for predefined messages.
5. Save your work.