Changes made by 64/299/EEC: Council Decision of 8 May 1964 on co-operation between the competent government departments of Member States in the field of budgetary policy
EU Decision 1964/299
No changes made by 64/299/EEC: Council Decision of 8 May 1964 on co-operation between the competent government departments of Member States in the field of budgetary policy are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.