Symptoms:
When you try to submit a timesheet on Standard 2.0 timesheet the following error is displayed,
 
"There are errors on this timesheet that pervent it from being submitted. You are no longer allowed to enter time against a task/project."
 
 
Cause:
There could be a project/task which was assigned to you and now you or your department have been un-assigned from that project. Hierarchy filtering was enabled recently and your department is not assigned to the project anymore.
 
Resolution:
One of the following choices will help resolve this issue,
  • If you intend to enter time for a project/task then you or your department have to be assigned to that project. 
  • If you or your department were un-assigned from the project after hierarchy filtering was enabled then the department to which the project belongs has to be added as "Additional Department" in your user profile.