My employee cannot register time. (S)he has been employed here before.

Case:

My employee can not register time. He was able to do it when he was employed before.

Solution:

When an employee is set as inactive as a user in the system, (s)he will be deactivated on all projects (s)he has registered time on before.

If you reactivate an employee, you also need to reactivate him/her at the projects (s)he was working on before. Otherwise, the timesheet will be empty. You do this by following these steps on the project: 

1. Navigate to the Resource group 
2. Mark Inactive resources
3. Delete the checkmarks on the employees that should NOT be reactivated
4. Click Select action at the top, select Reactivate and click OK
5. Click Save below the list of employees to make sure the system is updated with the changes