You may be able to edit items you approve, depending on your permissions. You might choose to do this to expedite approval of an item that requires correction. Alternatively, you can reject items that require correction, and have each item’s owner make changes and resubmit.
You can't edit when approving time entries.
To edit an item:
If you’re editing a timesheet or expense sheet, click the Edit button.
This button is located at the top of the page on timesheets, and at the bottom of the page on expense sheets.
If you are the item’s only approver, the item will be automatically approved once you submit it, as your approval is implied.
If you make changes to an item, the item’s owner will receive a notification that a change has been made, assuming these notifications are enabled for them. The notifications state who made the change and when.
Yes, providing the Prevent Changes to Invoiced Timesheets workflow condition isn’t enabled in the timesheet’s template. Refer to Correcting billing errors for more information.