Many of our users are in the system to log or track their time against projects. Our process is that a Project Owner has to approve project hours for a user (whose timesheet can sometimes can span a few projects) and then the system admin closes the timesheet for processing. However, users often Click Submit For Approval on their timesheets before the project owners approve the project hours. Could you a add a column to the timesheet view to show users that a project owner has approved their hours? That way they can monitor and submit them only once.
