1. Customs declarations shall contain all the particulars necessary for application of the provisions governing the customs procedure for which the goods are declared. Customs declarations made using an electronic data-processing technique shall contain an electronic signature or other means of authentication. Paper-based declarations shall be signed. The Commission shall, in accordance with the regulatory procedure referred to in Article 184(2), adopt measures laying down the specifications to which customs declarations must correspond.
2. The supporting documents required for application of the provisions governing the customs procedure for which the goods are declared shall be made available to the customs authorities at the time when the declaration is lodged.
3. When a customs declaration is lodged using an electronic data-processing technique, the customs authorities may also allow supporting documents to be lodged using that technique. Customs authorities may accept, instead of the lodging of those documents, access to the relevant data in the economic operator’s computer system. However, upon request by the declarant, the customs authorities may allow those documents to be made available after release of the goods.
4. The Commission shall, in accordance with the regulatory procedure referred to in Article 184(2), adopt measures for the implementation of paragraphs 2 and 3 of this Article.