(DUTY) [adjective] [not gradable] - be supposed to to have to; to have a duty or a responsibility toThe children are supposed to be at school by 8.45 a.m.What are you doing out of bed - you're supposed to be asleep.You're not supposed (= allowed) to park here.
SUPPOSED
Meaning of SUPPOSED in English
Cambridge English vocab. Кембриджский английский словарь. 2012