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Minimum number of days in a week for all students  shall do the trick but I could not find such constraint for students but there is one for teachers.

Funny idea: If you don't have a complex students' structure you might consider a real students set = a FET teacher, and have in FET only teachers, and add a constraint teacher min days per week for each real students set

Sorry, this would not work.

you can maybe do it indirectly.
for example by reducing the max number of hours per day they will be forced to have more days per week.

I have tried all those things but failed to get a solution.  I have never used the other constraint, max occupy. Let me try.

Minimum number of days in a week for all students  shall do the trick but I could not find such constraint for students but there is one for teachers.

Thanks for your suggestions.  Volker's first suggestion would not work since there shall be some activities scheduled not just reporting.  I need to checkout the second one.

I have a situation. I have enforced minimum and maximum hours in a day as well as maximum days per week for students. This results in empty days. But is it possible to control this empty days does not fall on a specific day. For example: we expect all the students report to school on Thursday. How to enforce this?
Thanks.
Paul