The main commodity is the one representing the highest value fraction of the procurement.

Namespace
cac urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2
Child elements
Card Name Description
1..1 cbc:ItemClassificationCode

Main item classification code
The main commodity classification code for goods, works and services is specified using the codelist for Common Procurement Vocabulary (CPV). (External Codelist provided at https://op.europa.eu/en/web/eu-vocabularies/dataset/-/resource?uri=http://publications.europa.eu/resource/dataset/cpv)