The approval process has different statuses for the timesheet. Each status is described below.
The timesheet may or may not have been saved, but has not been submitted. When it is in this status the timesheet can be edited by the user.
The timesheet has been submitted for approval by the user. The timesheet is now in read-only mode. An approver can now approve this time.
The submitted timesheet has been approved by a user with approval access. The timesheet is in read-only mode.
The submitted timesheet has been rejected by a user with approval access. The timesheet status changes to un-submitted which will allow the user to make changes to the timesheet.
Once a timesheet is approved it can be re-opened. If a timesheet is re-opened, the status is then changed to un-submitted which will allow the user to make changes to the timesheet.