Relation, authorisation and sequence errorsDomain & value

CDS12016Date Error: The acceptance date must not be in the future and must not be more than 180 days in the past.

HMRC explanation

Supplementary declaration is too late or predates acceptance

The date when goods were accepted for the simplified declaration or EIDR must not be more than 365 days in the past (or 200 days for a type Q declaration) and also cannot be in the future (cannot be before the goods are accepted).

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