Notification on date column

Hi, I want to create a notification for when someone other than the project manager, changes a date in a date column ('Start' and 'Finish'). No-one else except for the PM should be able to do this because the column is locked and no-one else has Admin or Owner permissions; however the cell history tells us another user has, so we seem to be encountering a bug and have raised a ticket separately. I now want to set up a notification so if this happens again, we can at least be alerted to it.

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