CDS12118 — Relation error: Consignor (DE3/1) information must be supplied for the 17X Additional Procedure Code at either header or item level and cannot be declared at both levels

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.