Subject - Constraints
subject, constraint, settings, distribution
For each subject you can set some basic constraints. In dialog "Subjects", select the subject and click on the button "Constrains". The dialog "Constraints - Subject" will appear:
In this dialog you can:
A: Set that the subject requires Homework preparation. It means that this subject is "more difficult" and you may not want to have "to many" such subjects in one day for a class. 
See: Homework preparation
B: Set the maximum allowed number of lessons on question marked positions, in subjects Time-off. 
See: Max one history lesson on 6th-7th position in each class (solution 1)
 
C: Double lessons of this subject can be over breaks. 
See: Certain longer lessons can be over all breaks
D: Lessons from this subject can be over lunch free periods set in class's details.
See: Lessons for specific subjects can be over lunch free period
E: Specify, how will be the length of the lessons counts to teachers contract. 
See: Lesson's length counting in teacher's contract
F: Specify Max number students allowed on lessons for the subject.  
See: Max students for certain seminar lesson
G:  Specify the card distribution. 
See: Modifying the default card distribution per week for the subject
H: Just select the grade this subject is supposed to be teaching in.
I: Specify, that the lessons from the selected subject are temporary. 
See: Temporary subjects - quickly add extra activities for teachers into their schedule
Note:
You can input these options anytime later during the timetable creation process. So for a start you can ignore them and maybe later, when you will be improving your timetable, you can input more of these constraints. 
 
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