Once a timesheet is approved, the approved entries are locked from further editing by members who submitted them.
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Please note that this does not mean that the entire week is locked. Members can still add new time logs and submit them for approval again.
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If you need to lock a specific period from further editing and prevent members from adding more time, you can set up automatic locking. Here's how >>>

Administrators are able to make edits to approved entries. However, you need to edit them log by log, they can’t be edited in bulk.