The main aspects of the modernized FTA (free trade agreement) between the UE and the Chile are: accounting segregation for fungible materials; non alteration principle; claim for preferential tariff treatment by means of either statement of origin (with REX for EU economic operators) or importer knowledge; requirement of record keeping; bilateral cumulation EU-Chile; right of the parties to study more complex ways of cumulation. The AEO authorization can support the economic operator in ensuring high compliance with the obligations of the FTA.