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Cool, thank you!

Yes, I understand this use case. This is when the minimum per morning or afternoon is larger than the minimum per half day.

But say I want to allow teachers to have a minimum of 1 lesson per half day, but if they work in the morning, it should be two at least. So the following is possible:
M A
0 0
2 0
2 1
2 2
etc.

This is not possible with this restriction. Why do you need this restriction, what harm would it do to remove it?

BTW, do you happen to know if Untis supports this?

Then I don't understand the point of having min. hours mornings or afternoons in the first place. Because these numbers can never be lower than minimum hours daily.

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

I don't understand the problem here. The problem persists, even if I add a constraint 'minimum hours per real day'.

If I add a constraint 'minimum hours per day', then this obviously also forces FET to make a minimum number of hours for each afternoon. I don't want this, this is the exact reason why I chose the 'minimum hours per morning' in the first place.

Surely this must be a bug?

Yes, I understand. Such a change would possibly fundamentally change the core of the algorithm I suppose.

But I suppose then, that much of Europe functions the same way. (This has nothing to do with FET,) but I do wonder why this system is so popular. Who cares if one has has sports or other soft subjects with a predetermined teacher every year. I would assume that optimizing the schedules for the teachers would have far larger benefits.

You could use the Block planning mode in this way, but, since you need gaps constraints for your teachers, this is impossible. Otherwise, FET needs each activity to have a certain teacher (or more, or empty).

I was afraid you were going to say that. But is this scenario really that uncommon? I would have assumed that in many institutions there are home room teachers for certain subjects, but otherwise (for other subjects( the teacher is irrelevant. Or is it your experience that most schools function this way? Am I the first to ask this or is this a common question?

Unfortunately, you cannot tell FET to allocate a teacher to an activity. Each activity must have a subject, a set of teachers, and a set of students sets.

This is actually pretty surprising to me. I would have assumed that in many countries, the classes have a fixed teacher for a fixed subject. But I would have thought that in some systems, it's totally irrelevant which classes a certain teacher teaches, as long as he gets the target amount of lessons of a certain subject... So basically FET cannot be used in this scenario, right?

Also, just to make sure: qualified subjects and target lessons have no influence on the algorithm?

There is not much more to it than mentioned, I have 12 classes, each of them has a double lesson of art each week, and I have two teachers who teach these 24 lessons. Which teacher has which class is irrelevant.

Of course, I have constraints for each of these 2 teachers, with regards to gaps, maximum days to work, etc. etc.

This may be a dumb question, but I can't find a solution in the docs.

Let's say there is a subject like art, and for each class, FET can dynamically allocate a teacher. How do I create these activities correctly?

I have entered the 'qualified subject' and the 'target hours' for the teachers in question.

Yes, thank you very much, the bug is solved!!

I also just tried it on my other (older) Mac mini, but it works there too of course, I guess it doesn't matter anymore whether it would have worked there

I didn't try 6.3.4 on the M2, just the most current version.

I can confirm that the crash doesn't happen on 6.3.4 on my old laptop running Catalina.

Maybe it's got something to do with my M2...

OK. The next thing I will do is try to reproduce it on my older MacBook Pro, for this I'll need an older version of FET, but I think someone posted some links on the forum so I should find one.

If I can't reproduce it there, I'll try to go the debugger route.

I would be very grateful if someone could try and reproduce this bug, I find it highly unlikely that it's affecting just me. Having to choose every activity individually is very cumbersome as the filters are not working.