hello, does anyone know how to model this constraint in Lingo?
Variable: X(i,j) = 1 if task i is assigned to employee j, 0 else

'employees can only perform tasks which are mentioned in their qualifications' => X(i,j) should be 0 if task i is not in qualification j

data:
tasks (task, starttime, endtime):
1 0 15
2 1 3
3 4 8
qualifications(emplyee, tasks...)
1 1 3
2 2 3
3 3 2

Thanks a lot!