CDS40073When de-risking AI code 'NIREM' is entered at item level in D.E. 2/2, either 'NIIMP' or 'NIDOM' AI codes must also be entered at item level on the same goods item

HMRC explanation

You declared NIREM additional information code on its own
NIREM additional information (AI) code may not be declared in isolation; NIDOM or NIIMP must also be declared on the same item.

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

What to check across the Domain and value errors

A code or value is not recognised, does not apply to the commodity, conflicts with a tariff measure or condition, or is duplicated. Check the code list for the element, the measures for the commodity code on the UK Trade Tariff, and any preference, unit or document code tied to those measures.

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