Supplementary Acts Supplementary Act A/SA. 2/12/17 Adopting The ECOWAS Custom Code Supplementary Act A/SA.7/12/18 Fixing Community Rules Of Origin And Procedures Applicable To Goods Originating In The Economic Community Of West African States (ECOWAS) Supplementary Act A/SA.6/12/2018 Relating To Mutual Assistance And Cooperation Between The Customs Administrations Of ECOWAS Member States And The Collaboration Between Them And The ECOWAS Commission In Customs Matters.