Artikel 33

If a Contracting State has two or more territorial units in which different systems of law apply in relation to the recognition and enforcement of maintenance decisions, 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 its declaration by submitting another declaration at any time thereafter.
These declarations shall be notified to the Ministry of Foreign Affairs of the Netherlands, and shall state expressly the territorial unit to which the Convention applies.
Other Contracting States may decline to recognise a maintenance decision if, at the date on which recognition is sought, the Convention is not applicable to the territorial unit in which the decision was rendered.