In order to cancel a checked-in reservation, we should first Undo the check-in and then cancel it.

To Undo the check-in, please head to the Manage ( Details of the reservation) and navigate to the Status tab:

Click on Undo check-in and provide a reason for the action:

You will then be able to Cancel this reservation on the same page:

If an error mentioning the Editable history window pops up, click on the following article to extend it.

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