An identifier that can be used to reference the attached document, such as an unique identifier

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
88d15eaa-3805-42e4-825f-5e240838104d
Rules
Identifier/Error message Flag
EUGEN-T68-B18501
Document MUST NOT contain elements not part of the data model.
fatal