An catalogue instance must contain an identifier. The identifier enables positive referencing the document instance for various purposes including referencing between transactions that are part of the same process.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Identifier
Example value
Cat-02
Business terms
tir19-003
Rules
Identifier/Error message Flag
EHF-T19-B00401
Document MUST NOT contain elements not part of the data model.
fatal