you weren't supposed to
Je t'avais dit que tu ne devais pas le faire.
I told you that you weren't supposed to do it.
Tu ne devais pas te rendre au Palais ?
Weren't you supposed to go to the Palace?
— Le Château ambulant (2004)
Tu ne devais pas reprendre le domaine ?
Weren't you supposed to take over the estate?
— Caché (2005)