Header and item relation errorsRelation & missing element

CDS11012Element is not allowed to be amended on this declaration type

HMRC explanation

Element is not allowed to be amended on this declaration type

Check your amendment request. For example, you cannot change a declaration from prelodged (D) to arrived (A) through amendment, only through goods arrival.

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

What to check across the Header and item relation errors

Values across the declaration do not agree, for example the total number of items against the items declared, or net mass against gross mass. Check the header totals against the item lines, the trade movement and declaration type against the requested procedure, and whether the element you are amending can be amended on this declaration type.

A declaration that clears CDS can still be wrong

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