Licence and document errorsRelation & missing element
CDS71200Uniqueness Error: Document Codes with identical IDs are not permitted on a single goods item
HMRC explanation
What to check across the Licence and document errors
A licence or document is the wrong type for the declaration, already used, exhausted, inactive, or declared inconsistently across the goods items. Check the licence type, its status and balance, and that every instance on the declaration uses the same details.
A declaration that clears CDS can still be wrong
The free eligibility checker confirms your import activity and whether a free post-clearance audit applies. No data upload, no commitment.
Source: HMRC, Customs Declaration Service error codes, Open Government Licence v3.0. GOV.UK publication · Licence