Students not available, if possible (<100%)

[Horatiu]

I want the students to be unavailable at a certain time, but I would like to add this as a "light" constraint (less than 100% weight).
So far I've come up with this solution: define a dummy activity, and set "preferred time slot" for it, with <100%.

But this dummy activity may create additional gaps in the timetable if it is not placed as desired. So any advice is more than welcome;)

[Liviu Lalescu]

This one is a classic :-)   : Activities preferred time slots, specify only the students set. Neglect the warning.

[Horatiu]

I have activities with groups and years. I should add constraints for both (groups and years)? As far as I remember, FET does not carry constraints from years to groups (if I add constrain for years, there may be group-level activities scheduled for that timeslot, and viceversa).
Am I making any sense here...?

[Liviu Lalescu]

I have activities with groups and years. I should add constraints for both (groups and years)? As far as I remember, FET does not carry constraints from years to groups (if I add constrain for years, there may be group-level activities scheduled for that timeslot, and viceversa).
Am I making any sense here...?

In this case, it carries. Also for not available, it carries. I think you are wrong when saying "As far as I remember, FET does not carry constraints from years to groups", or could you give me an example?

[Horatiu]

I checked. My mistake - groups/subgroups confusion.
Problem solved (again)

Thank you!