Enter the unavailability of lessons

You can enter unavailability for lessons as you do for teachers, classes and rooms. This allows you to indicate, for example, that the lessons of a given subject must imperatively take place in the morning (unavailability in the afternoon in this case). Lesson unavailability is in addition to resource unavailability. They are strictly complied with during automatic placement. During manual placement, they are indicated, but the user can ignore them. Wishes, on the other hand, indicate the time slots to prioritize during the placement. They are preferences, not constraints: PRONOTE Campus tries to comply with them, but this is not guaranteed.