Also in the IACHR, for example, in Inter-American Court Advisory Opinion OC-4/84, 'Proposed amendments to the naturalization provisions of the Constitution of Costa Rica' paras. In such a Convention, the contracting States do not have any interests of their own; they merely have,one and all, a common interest, namely, the accomplishment of those high purposes which are the raison d'etre of the convention. Consequently, in a convention of this type one cannot speak of individual advantages or disadvantages to States, or of the maintenance of a perfect contractual balance between rights and duties.” Advisory Opinion of 28 May 1951 (ICJ Report 1951, p. 23).