Identifies the specification of content and rules that apply to the transaction.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
urn:www.cenbii.eu:transaction:biitrns19:ver2.0:#urn:www.difi.no:ehf:katalog:ver0.99
Rules
Identifier/Error message Flag
BII2-T19-R001
A catalogue MUST have a customization identifier
fatal