How to stop users from editing their approved timesheets?

To prevent users from editing their approved timesheets, follow the steps given below:

• Select Administration from the top menu bar.
• Select Users from the left pane, under the Users/Departments category.
• Edit the users profile.
• Note down all the permissions assigned to the users.
• Select Permission from the left pane, under Users/Departments.
• Edit the permission(s) assigned to the users by clicking on the edit button beside the permission.
• Expand timesheet option by clicking on the little plus sign.
• Uncheck the option Allow reopen of timesheet after approval.
• Click Save.
• Repeat the above steps for all the permissions assigned to the user(s)