An identification of the transaction on which the tendering message is based upon.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
urn:fdc:peppol.eu:prac:trns:t010:1.1
Business terms
tir65-022
Rules
Identifier/Error message Flag
PEPPOL-T018-R036
Element 'cac:LineReference' MUST be provided.
fatal
PEPPOL-T018-R037
Element 'cac:Response' MUST be provided.
fatal