Activate Freezing of Schedules in Customizing if you want to allow app users to freeze schedules in the app. Freezing a schedule is a prerequisite so that schedule execution can be tracked once the schedule period has started.
Schedules that are not frozen are deleted automatically once the schedule period starts.
Frozen schedules are deleted in resource scheduling if a relevant maintenance order is archived (archiving object PM_ORDER). A maintenance order is relevant if your schedule includes at least one order operation from this order.
If you deselect this checkbox again at a later point in time and frozen schedules exist, these schedules are not deleted, even if a relevant maintenance order is archived.
Watch the demo on how to check and freeze a schedule.