An identifier that is specified by the buyer and used as a reference number for all documents in the procurement process. It is also known as procurement project identifier, procurement reference number or contract folder identifier.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Identifier
Rules
Identifier/Error message Flag
PEPPOL-T019-R006
Element 'cbc:ContractFolderID' MUST be provided.
fatal
PEPPOL-T019-R024
The ContractFolderID MUST be expressed in a UUID syntax (RFC 4122).
fatal