Relation, authorisation and sequence errorsRelation & missing element

CDS12103Relation error: Valid delivery destination is required in D.E.5/8 for a CO declaration

HMRC explanation

Relation error
When declaring Declaration Type code CO in data element 1/1, the destination country must be a Special Fiscal Territory or other territory with which the EU has formed a Customs Union.

Source: HMRC, Customs Declaration Service error codes, Open Government Licence v3.0. GOV.UK publication · Licence

What to check across the Relation, authorisation and sequence errors

Two elements, or a value and a rule, disagree. Read both elements together: completing one element with a particular code often requires another value, and the fault is frequently in the element you did not change. The family also covers parties and authorisations that are not recognised, references that must be unique, and messages sent out of sequence.

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.

Run a free audit

Source: HMRC, Customs Declaration Service error codes, Open Government Licence v3.0. GOV.UK publication · Licence