It was previously not possible to allocate a room in the room allocation dialogue for a scheduled period in the timetable where the underlying lesson had no value entered in the 'home room' or 'subject room' fields. This has now changed. The 'Allocate / Delete this room' ´dialogue can now be called for any period in the timetable.

If a room is allocated to a lesson in this way, the room will be automatically entered in the 'subject room' field for the lesson in question.
