1. Where an origin has been indicated in the customs declaration pursuant to 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 customs legislation or other Community 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 does comply with the rules laid down by the relevant Community legislation.
3. A document proving origin may be issued in the Community where the exigencies of trade so require.