Check availability functionality
Article 5
1. Where a supporting document is referenced in a customs declaration or re-export declaration, EU CSW-CERTEX shall: (a) verify that the supporting document is available and retrieve it from its respective Union non-customs system; (b) transform the data included in that supporting document in accordance with Articles 1, 2 and 3; (c) transmit the data, together with the original supporting document where requested, to the national single window environment for customs where the customs declaration or re-export declaration was lodged. 2. If the status of a supporting document changes in a manner that would affect the identification of procedures in accordance with Article 1, EU CSW-CERTEX shall perform the actions referred to in paragraph 1 of this Article in an automated manner.