aSc TimeTables - Constraints - ClassesThis article is available in:
How to specify that class can have max one 7th lesson or max one 0lesson?
Then you can say the class shall have max one lesson on the question marked positions. This can be done in Class's details:
In this case you can use advanced card relationship. Here you can specify the area and maximim number of the cards in this area per week.
Please check this picture:
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