HMRC has published guidance specifying the document codes, document status codes, and declaration details required for Data Element 2/3 within the Customs Declaration Service. The guidance includes Appendix 5A, which sets out the relevant codes for licences, certificates, and other supporting documentation that must accompany customs declarations. This reference material applies to traders and agents submitting declarations through CDS and clarifies which documents must be referenced at declaration submission.
Source: HMRC (GOV.UK) – Read the original