Dvostruki predmeti ne mogu biti nakon dugih pauza

Za određene predmete možete odrediti da dupli sati ne mogu biti nakon dugih pauza. Na primjer, ne želite pustit djecu da imaju užinu između sata laboratorija kemije.

First you have to add the breaks into the timetable:
How can I print breaks between lessons? (Recess/Lunch etc)

Then by default all double lessons cannot span over these breaks.

If you allow certain double lessons to span while others not that you can define for each subject individually if double lessons of this subject can or cannot span over the breaks. You can do this in subject Constraints: