Hi ,
Here's what you need to do.
1. create a BOR / Copy a standard BOR / or create a Subtype of a Standard bor
2. create an Click on the EVENT in the BOR and click on Create icon in the application toolbar .
3. Give a Name the the Event .
4. now in the BADi Implementation / or a the Save Exit of the Notification call the function Module sap_wapi_create_event when you want the event to trigger- in your case when it is approved. ( give the name of the the BOR you create , with its key attribute - will the the notification number , and the event of the BOR you want to trigger . )
5. create a workflow and set it's triggering point to be the Event of the BOR that you've create.
Now every time a notification is approved the sap_wapi_create_event is executed which triggers the event and this in turn Starts the Workflow that subscribes to that event. ( this should now show up in the SWEL transaction ) .
Hope this helps .
Amarpreet .