Changes to Commission Directive 76/527/EEC of 4 June 1976 on the calculation of total or partial relief from import duties under the outward processing procedure
EU Directive 1976/527
Made by Commission Directive 86/161/EEC of 4 April 1986 amending Commission Directive 76/527/EEC of 4 June 1976 on the calculation of total or partial relief from import duties under the outward processing procedure in respect of accession compensatory amounts
From legislation.gov.uk's record of changes, the official one: see it there.