Some countries ask for a certain document of product for tariff purposes, the document verifies the original country of the identified products.

A certificate of origin (CO) is a document announcing in which nation a commodity or product is manufactured. The certification of origin includes information considering the product, its destination, and the country of export. Asked by lots of treaty arrangements for cross-border trade, the CO is a significant form since it can help determine whether particular products are eligible for import, or whether products are subject to duties.