Origin determination rules require evidence and a certificate for preferential tariff concession on qualifying imports under the Bangkok Agreement These Rules set criteria and procedures for claiming Special Tariff Concession for goods consigned from Bangkok Agreement Member States: the importer must claim eligibility at importation and produce prescribed evidence; a proper officer must be satisfied that origin conditions in the Schedule are complied with. The Schedule requires that wholly produced goods be produced within the exporting territory, and that partly or wholly manufactured goods have the final process in that territory with at least fifty percent of ex-factory cost attributable to goods produced and labour performed there; origin claims must be supported by a certificate of origin from an authorised body.