moreover article paragraph of the convention adopts the impermissibility principle contained in the vienna convention on the law of treaties which states that a reservation incompatible with the object and purpose of a convention shall not be permitted it has consistently called upon states parties to withdraw them and ensure that their legal systems conform to the convention in general and to article in particular the committee has stressed that article among others is central to the object and purpose of the convention and that the reservations impact negatively on the enjoyment by women of their rights as such the reservations to article contradict the convention s core principles of equality between men and women and can undermine countries efforts to achieve gender equality