A transaction instance must have an identifier. The identifier enables referencing the transaction for various purposes such as from other transactions that are part of the same process.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
01
Rules
Identifier/Error message Flag
BII2-T01-R006
An order MUST have a document identifier
fatal