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With regard to the recognition and enforcement of decisions between Contracting States to this Convention that are also Parties to either of the Hague Maintenance Conventions mentioned in Article 48, if the conditions for the recognition and enforcement under this Convention prevent the recognition and enforcement of a decision given in the State of origin before the entry into force of this Convention for that State, that would otherwise have been recognised and enforced under the terms of the Convention that was in effect at the time the decision was rendered, the conditions of that Convention shall apply.