Article 52 — Territorial units
1. If a Contracting State has territorial units in which different systems of law are applicable in relation to the matters dealt with in this Convention, it may, at the time of ratification, acceptance, approval or accession, declare that this Convention is to 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.
2. Any such declaration shall state expressly the territorial units to which this Convention applies.
3. If a Contracting State has not made any declaration under paragraph 1, this Convention shall apply to all territorial units of that State.
4. Where a Contracting State extends this Convention to one or more of its territorial units, declarations permitted under this Convention may be made in respect of each such territorial unit, and the declarations made in respect of one territorial unit may be different from those made in respect of another territorial unit.
5. If by virtue of a declaration under paragraph 1, this Convention extends to one or more territorial units of a Contracting State:
(a) the debtor is considered to be situated in a Contracting State only if it is incorporated or formed under a law in force in a territorial unit to which this Convention applies or if it has its registered office or statutory seat, centre of administration, place of business or habitual residence in a territorial unit to which this Convention applies;
(b) any reference to the location of the object in a Contracting State refers to the location of the object in a territorial unit to which this Convention applies; and
(c) any reference to the administrative authorities in that Contracting State shall be construed as referring to the administrative authorities having jurisdiction in a territorial unit to which this Convention applies.