A user deletes an occurence because a few people are ill. Five minutes later the superior enters the office and says the meeting happens anyway. Or the user deletes a wrong occurence.
Resetting the recurrence might not be an option for long running meetings. Like weekly Scrum, project jour fix, ... where the other exceptions should persist. Currently the user has to create a new, separate event.
The exceptions could be rendered as multiselect or list in a separate window which opens after a button click. That way the recurrence editor would not look messy with lots of exceptions.