Relation, authorisation and sequence errorsRelation & missing element

CDS12138Relation Error: Provided Additional Procedure Code (D.E. 1/11) cannot be used on a Type J/K (EIDR) declaration

HMRC explanation

Additional procedure code is not allowed

These additional procedure codes cannot be used with an EIDR C21 declaration.

1CD - Controlled drugs using Simplified Procedures 1CG - Controlled Goods using Simplified Procedures

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.

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