An identification of the specification containing the total set of rules regarding semantic content, cardinalities and business rules to which the data contained in the instance document conforms

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
urn:www.cenbii.eu:transaction:biitrns110:ver1.0:extended:urn:www.peppol.eu:bis:peppol42a:ver1.0
Rules
Identifier/Error message Flag
EUGEN-T110-R007
Customization id must be: urn:www.cenbii.eu:transaction:biitrns110:ver1.0:extended:urn:www.peppol.eu:bis:peppol42a:ver1.0
fatal
BII3-T110-R001
An order agreement MUST have a customization identifier
fatal