Artikel 59

1. A Regional Economic Integration Organisation which is constituted solely by sovereign States and has competence over some or all of the matters governed by this Convention may similarly sign, accept, approve or accede to this Convention. The Regional Economic Integration Organisation shall in that case have the rights and obligations of a Contracting State, to the extent that the Organisation has competence over matters governed by the Convention.
2. The Regional Economic Integration Organisation shall, at the time of signature, acceptance, approval or accession, notify the depositary in writing of the matters governed by this Convention in respect of which competence has been transferred to that Organisation by its Member States. The Organisation shall promptly notify the depositary in writing of any changes to its competence as specified in the most recent notice given under this paragraph.
3. At the time of signature, acceptance, approval or accession, a Regional Economic Integration Organisation may declare in accordance with Article 63 that it exercises competence over all the matters governed by this Convention and that the Member States which have transferred competence to the Regional Economic Integration Organisation in respect of the matter in question shall be bound by this Convention by virtue of the signature, acceptance, approval or accession of the Organisation.
4. For the purposes of the entry into force of this Convention, any instrument deposited by a Regional Economic Integration Organisation shall not be counted unless the Regional Economic Integration Organisation makes a declaration in accordance with paragraph 3.
5. Any reference to a “Contracting State” or “State” in this Convention shall apply equally to a Regional Economic Integration Organisation that is a Party to it, where appropriate. In the event that a declaration is made by a Regional Economic Integration Organisation in accordance with paragraph 3, any reference to a “Contracting State” or “State” in this Convention shall apply equally to the relevant Member States of the Organisation, where appropriate.