Glossary of customs terms AES / ECS ATLAS Export declaration Export Accompanying Document (EAD) Export process - two-stage Customs office of export Customs office of exit Export certification by the customs office ECS / AES EORI Exports under 1.000 EUR Commercial invoice Internet Export Declaration (IAA) Internet Export Declaration Plus (IAA Plus) MRN Pro forma invoice Simplified Procedure (approved exporter) Movement Certificate Customers agent Customers number Approved exporter