Changes made by 63/9/EEC: Council Decision of 14 May 1962 determining the appointing authority for the Secretariat of the Councils
EU Decision 1963/9
No changes made by 63/9/EEC: Council Decision of 14 May 1962 determining the appointing authority for the Secretariat of the Councils are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.