thank you for your answer. I'm not sure I understand right the feature which you suggest.
I tried add 1 contraint for all activities of 1 teacher have 2 continouosly activities though the break as below picture.
But it generate failed.
I tried change time splot only morning hours or only afternoon hours near the break and the result same.
I tried add 1 contraint for all activities of 1 teacher have 2 continouosly activities though the break as below picture.
But it generate failed.
I tried change time splot only morning hours or only afternoon hours near the break and the result same.