Proof of origin
Article 61
1. Where an origin has been indicated in the customs declaration pursuant to the customs legislation, the customs authorities may require the declarant to prove the origin of the goods. 2. Where proof of origin of goods is provided pursuant to the customs legislation or other Union legislation governing specific fields, the customs authorities may, in the event of reasonable doubt, require any additional evidence needed in order to ensure that the indication of origin complies with the rules laid down by the relevant Union legislation. 3. Where the exigencies of trade so require, a document proving origin may be issued in the Union in accordance with the rules of origin in force in the country or territory of destination or any other method identifying the country where the goods were wholly obtained or underwent their last substantial transformation.