Б272
ЧТОБЫ НЕПОВАДНО БЫЛО (ЧТОБЫ HE БЫЛО ПОВАДНО) (кому)
collthese forms onlysubord clausethe main clause indicates how
s.o. was or will be punished, or expresses a threat to punish
s.o.fixed WO ( s.o. was or will be punished, rebuked etc for some wrongdoing) so that he or another will not commit a similar wrongdoing (again): чтобы (X-y) неповадно было - (in order) to teach X a lesson
as a lesson to Xso that X will know better (think twice) next time.