Case C-100/22 P: Judgment of the Court (Sixth Chamber) of 4 May 2023 — KY v Court of Justice of the European Union (Appeal — Civil service — Officials — Staff Regulations of Officials of the European Union — Article 77 — Pension — Article 11(2) of Annex VIII to the Staff Regulations — Transfer of national pension rights to the pension scheme of the European Union institutions — Crediting of additional pensionable years — Article 2 of Annex VIII to the Staff Regulations — Pension calculation — Fourth paragraph of Article 77 of the Staff Regulations — The ‘minimum subsistence figure’ rule — Request for reimbursement of the portion of the transferred pension rights not reflected in the EU pension amount — Unjust enrichment)