Yes, in Real Work Allocation screen (time sheet)

I can See validate work which i think mean Approve so i was wondering where can i find the reject time sheet function ?

The "Real work allocation" screen is just for entering the real work on tasks.

Approval (Validation) is just for freeze real work entry.

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You must distinguish need between project management and administrative system.

That is why, ProjeQtOr named this screen "Real work allocation", but not "Timesheet".

In general, project management softwares don't provide an "administrative" timesheet.

An evolution is planned in version 5.5, to export real work.
Ticket #1700