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  Can a lesson be prevented from being modified?

You can prevent the software from moving lessons. Select a lesson on the timetable grid or in the list of lessons in the display Timetable > Lesson > List, right-click, then select Lock non de-positionable or Lock in the same place.

If you lock a lesson with the yellow padlock, you authorize the software to move the lesson to another slot, but not to de-position it. If you lock a lesson with the red padlock, you prevent the lesson from being moved to another time slot. Regardless of the color of the padlock, you can still change the location of the lessosn if you move them manually.