I have a rule to email the user when they are on the waiting list. If there is a cancellation the next on the waiting list is registered. Now I want to notify the user that has been moved from the waiting list to the registered list. If I use a trigger - After deleting a registration and set the condition to Data value: complete and set the email. The person that is cancelled receives the email. How do I reach the person that moved from the waiting list to the complete list.
Drupal 7.59 Entity API: 7.x-1.9 Registration 7.x1.6