Relation, authorisation and sequence errorsRelation & missing element

CDS12153Relation Error: EORIs with this country code are not supported

HMRC explanation

Relation Error
The country code at the start of an EORI must be GB when declaring any of the parties Importer (DE 3/16), Exporter (DE 3/2), Declarant (DE 3/18), Representative (DE 3/20).

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.

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