Additional Information (AI) Statement Codes for Data Element 2/2 of the Customs Declaration Service (CDS) Find out the codes to be used to provide additional information in Data Element (DE) 2/2 of the customs declaration or clearance request (Appendix 4). From: Contents This Appendix provides details of the codes to be used to provide additional information in Data Element ( DE) 2/2 of the customs declaration or clearance request. The completion of codes will be determined by the: Procedure or Additional Procedure Codes used in DE 1/10 or 1/11, The commodity code details declared in DE 6/14 – 6/17 or The main UK Trade Tariff, CDS Volume 3 Declaration Completion Guides.