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Why couldn't you add for this teacher min 2 hours daily?

No problem about your English!

I can't add the "Min hours per morning for a teacher" or "Min hours per affternoon for a teacher" constraint independently

It is difficult to understand about what you are talking. In FET every constraint is independent. You wrote your first message here and you are talking about constraint "2.8a", "2.8b" and "2.6". If someone search for this in the forum, he will find only this message. So nobody will understand about what you are talking. Please ask more detailed. Also your topic say nothing else than that you want to have a private talk. Please read how to write a message.

Sorry, I am Vietnamese, my English is not good

Hello, vietphamvan0705,

I understand what you wrote: you want to be able to use teacher(s) max hours per morning/afternoon without adding teacher(s) max hours per day, in the Mornings-Afternoons mode. I will add your suggestion in the TODO list, but it is unfortunately risky to change the currently working code.

But can't you simply use min hours daily with allow empty days? The only bad situation is you cannot force at least 1 hour on each day without allowing empty days, but this is an improbable situation.

Volker, in the Vietnamese language FET some constraints are numbered.

Cannot optimize, because you have constraint teacher min hours per morning for teacher Hồng but not also min hours daily for him. Please add a constraint teacher(s) min hours daily affecting this teacher.

So the Vietnam translation use random numbers? That is a bad translation. All other users won't understand it. If the Vietnam users want to number constraints, then they should use the official numbers from the source code; not a random one.

Cannot optimize, because you have constraint teacher min hours per morning for teacher Hồng but not also min hours daily for him. Please add a constraint teacher(s) min hours daily affecting this teacher.

Hello Liviu. I have a problem I want to discuss with you. Regarding Fet, is there a way to use constraints 2.8a and 2.8b independently without having to use constraint 2.6?