An transaction 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
Example value
1
Rules
Identifier/Error message Flag
BII2-T58-R004
A catalogue rejection MUST contain the response identifier
fatal