If you also store the interview event in an external calendar linked to ATS Recruitis, this external calendar may have generated its own invitation and it could be that the candidate received two invitations - one from ATS Recruitis and one from your Outlook or gmail.
To avoid this, we have also added an option to select whether you want to include the candidate in this override event.
If you omit it (i.e. do not check the option offered), the event in your calendar will not include the candidate among the invitees and therefore he/she will not receive a second invitation.