A transaction instance must contain an identifier. The identifier enables positive referencing the transaction instance for various purposes including referencing between transactions that are part of the same process. Must be expressed as a UUID.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Identifier
Example value
123e4567-e89b-12d3-a456-426614174000
Business terms
tir65-001