With the Source of calendars of the type "Attendance calendar" (calendars for Doctor, Holiday, ...) it is now possible to set "whose attendance can be seen in the calendar" and "to whom the calendar will be offered for display". You can thus create, for example, a "Vacation of warehouse workers" calendar, which will display the vacations of only people from the warehouse. For example, only warehouse managers will be able to view such a calendar, even though they do not have permission to view the attendance of warehouse workers.
