Summary:
The timesheet detail report can be run in such a way that the supervisor's name is displayed for the relevant users. However when the report is run, there are few users for whom the supervisor name does not get tagged. When the user profile is edited to check for the supervisor, a supervisor exists for the user.

Additional Information:
The supervisor's name will not be displayed if the user has not saved or submitted a timesheet. This means that if there are timesheets that are generated for the user, however the user does not ever save that timesheet, then the supervisor's name does not get tagged for that user when the timesheet detail report is run. It is not necessary that the time entries have to be made before saving the timesheet, however the timesheet either will have to be saved or submitted for the supervisor's name to be tagged in the timesheet detail report.