@ -116,9 +116,13 @@ class CalendarObject extends \Sabre\CalDAV\CalendarObject {
case 'CREATED':
case 'DTSTART':
case 'RRULE':
case 'RECURRENCE-ID':
case 'RDATE':
case 'DURATION':
case 'DTEND':
case 'CLASS':
case 'EXRULE':
case 'EXDATE':
case 'UID':
break;
case 'SUMMARY':