Upon receipt of an Unsubscribe request, the origin server shall attempt to remove the Workitem Subscription, Worklist Subscription, or Filtered Worklist Subscription of the specified Application Entity with respect to the specified Workitem UID, Worklist UID, or Filtered Worklist UID as described in Section CC.2.3.3 in PS3.4 and then return an appropriate response.

For a Workitem resource, this corresponds to the UPS DIMSE N-ACTION operation "Unsubscribe from Receiving UPS Event Reports".

For a Worklist or Filtered Worklist resource this transaction corresponds to the UPS DIMSE N-ACTION operation "Unsubscribe from Receiving UPS Event Reports" for the Global Subscription identified by the well-known UID.