Moreover, Article 28, paragraph 2 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 16 in particular. The committee has stressed that Article 16 (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 16 contradict the convention’s core principles of equality between men and women, and can undermine countries’ efforts to achieve gender equality.