'isInSchedule' method doesn't work as expected when a schedule has parent scheduleIssue 'isInSchedule' method in GlideSchedule API (Application Programming Interface) always returns false when a "cmn_schedule" that is loaded includes a parent schedule(another cmn_schedule record). ReleaseAllCause ResolutionA way to fix is instead of using the parent field in the schedule record. Use the cmn_other_schedule record which is an m2m mapping between two schedules. In the screen shot below, a schedule can be added as child schedule.