Application management : Alerts : Alerts - Concepts : Notify once definition
Notify once definition
The general properties of the Notify once definition comprise a filter that defines a condition to be periodically checked and a schedule that determines how often and when the condition is checked. The notification will only be sent once. To avoid unwanted email traffic, notification of subsequent matches of the condition will be skipped.
If you delete and recreate the Notify once definition, the items for which a notification was already sent will be notified again.
If you change the condition filter or choose another condition for the same business object definition, the items for which a notification is sent will not be notified again.
If you change the condition to another business object definition, (Reservations first and then Persons) you will get all new matching items.
The Notify once definitions are added and maintained at Alerts > Notify once definitions.