1 · What REX is
REX — the Registered Exporter system — is how the EU checks the origin of goods imported under its preference schemes. Exporters register once with their national authority and receive a REX number; after that, origin is proven by a short statement on origin on the invoice rather than a stamped certificate. European Commission (source: Registered Exporter (REX) system, opens in a new tab) European Commission (source: A guide for users on GSP rules of origin (REX, statements on origin, EUR 6,000 threshold), opens in a new tab)
For Nepal, REX replaced the old paper “Form A” certificate — Nepal’s transition to REX ended on 30 June 2018. Trade and Export Promotion Centre (TEPC), Government of Nepal (source: Extension of transition period for EU REX system in Nepal (Form A until 30 June 2018), opens in a new tab)