If there are errors on the timesheet - such as a missing punch or not enough vacation hours - you'll see that listed on the supervisor dashboard in the Exceptions box. You will also see the exception message on the timesheet and on the Approve Timesheets page. Some exceptions will also generate an email to you such as when someone other than the employee saves the timesheet. In addition, you can run reports to identify any exceptions on employees' timesheets.
See the following FAQs for more details: