Autotask - What happens if I delete an ARO task in Autotask?

We don't recommend this. Field Effect can’t detect deletions that occur within AutoTask, so sync issues will happen when deleting AROs from AutoTask. 

If you delete an ARO in Autotask, an integrity error occurs the next time the integration tries to synchronize. The ARO will then re-sync into AutoTask as a new ARO, but it will not back-sync with the original ARO.