Article 22

No Contracting State is obliged to extend the privileges and immunities referred to in Article 12, Article 13, Article 14, sub-paragraphs (b), (e) and (g) and Article 15, sub-paragraph (c) to:

(a) its own nationals;
(b) any person who at the time of taking up his functions with the Organisation has his permanent residence in that State and is not an employee of any other inter-governmental organisation whose staff is incorporated into the Organisation.