Here are steps/events for Oracle Workflow Notification Outbound Processing(eMail from Oracle Applications Workflow to Users)
1.When workflow Engine determines that a notification message must be sent, it raises an event in BES (Business Event System) oracle.apps.wf.notifications.send
Event is raised with Notification ID (NID) as event key
2. There is seeded subscription to this Event
3. Event is placed on WF_DEFERRED […]
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