When someone edits their registration, I am unable to see what they did. Do you know if the system can tell me if they added or deleted people?
Neither the Registration Modification email nor the DTRegister Records tab seems to provide enough details to know if the modification involved the addition or deletion of one or more people for the event.
Viewing the record in the backend or frontend will show ALL details of the edited record, but doesn't mark what has been changed. The message the admin receives about the change is hard-coded. You can modify that message in this file:
This will get you to the area of that change notification message. You should be able to pick out what is being generated here. You'll see it uses the email tags. You can put in other tags and such into this code to have that email list more data about that record.
However, there is no way presently for the email to list ONLY fields that were modified.