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Besides automatically locking the Billing Period, you also can lock and unlock them manually, for example when it’s already locked but a user still needs to correct something on his timesheet. To do that use the padlock icon next to the Period. When it’s dark grey - it means the Period is locked. When you click on it, it will change to unlocked. In the same way you can lock an unlocked active Period.
When a user tries to add, edit or delete a worklog within the locked Billing Period, the action will be blocked and he will be notified it’s because the Period is already locked.
