If a cancellation is retracted in the WebApp, a Task is sent to the user responsible for the Event .
The Remarks is also entered under Event > Added fields > Intranet (if the field is shown according to the configuration).
Set the Status of the event back to "On hold", "Confirmed" or "Contract".
Manually start the Job "WebApp_Intranet_V2_Status_Cancellation" in the toolbar of the event. This job deletes all cancellation details in the full client.