Case C-41/19: Judgment of the Court (Third Chamber) of 4 June 2020 (request for a preliminary ruling from the Amtsgericht Köln — Germany) — FX v GZ, represented for legal purposes by her mother (Reference for a preliminary ruling — Jurisdiction, recognition and enforcement of decisions in matters relating to maintenance obligations — Regulation (EC) No 4/2009 — Article 41(1) — Judicial cooperation in civil matters — Regulation (EU) No 1215/2012 — Article 24(5) — Maintenance order declared enforceable — Application opposing enforcement — Jurisdiction of the court of the Member State of enforcement)