International organizations — Immunity — Jurisdictional immunity — National of receiving State employed by international organization in managerial role — Whether integrated into organizational structure — Contract of employment — Termination — Claim for unlawful dismissal and reinstatement — Whether international organization entitled to jurisdictional immunity — Whether examination of legality of dismissal of employee involving interference with public functions of international organization — Bari Institute of International Centre for Advanced Mediterranean Agronomic Studies — Legal status — Whether engaged in ordinary commercial or public-law activities — Whether entitled to jurisdictional immunity — Paris Agreement establishing the International Centre, 1962 — Additional Protocol — Italian reservation — Whether recognition of jurisdictional immunity by municipal courts may violate guarantee of judicial protection for individuals under Italian Constitution, Article 24 — Requirement for international organizations to make adequate provision for settlement of employment disputes — Whether independent internal appeals procedure acceptable — The law of Italy