Artikel 26

If a Contracting State has two or more territorial units in which different systems of law are applicable in relation to matters dealt with in this Convention, it may at the time of signature, ratification, acceptance, approval or accession declare that this Convention shall extend to all its territorial units or only to one or more of them and may modify that declaration by submitting another declaration at any time.
Any such declaration shall be notified to the Ministry of Foreign Affairs of the Kingdom of the Netherlands and shall state expressly the territorial units to which the Convention applies.