Event Edited, Re-Approval Required Message

An event that was previously approved has been edited. The person who performed the edit has the permission "Revoke approval of an event when it is edited by this user or group."

You are an Approver for the Calendar.

You can disable this message if desired. To do this, login to the calendar and select the Toolbox Icon | Preferences from the menu. Check the option for "Disable Event and Resource Approval Request Messages" and save changes.