Event registration form doesn't prevent multiple signups for waitlisted participants.
CRM-2426 implemented duplicate registrant detection - but I suspect it predates waitlist functionality.
- Create an event with a max registrants of 1.
- Register a participant.
- Register a user for the waitlist.
- Register the waitlisted user for the waitlist again.
It looks like you are already registered for this event. If you want to change your registration, or you feel that you've received this message in error, please contact the site administrator.
Multiple registrations are permitted.