To receive an IDoc from an SAP system and pass it to a service, you can setup an synchronous ALE adapter notification or a routing notification. In either case, you need to assign the service you would like to invoke to the notification. For instructions on establishing routing notifications, refer to Routing Notifications. When choosing the transport for the routing notification, select the IS transport. For instructions on establishing asynchronous ALE listener notifications, refer to Creating a Synchronous RFC Adapter Notification.