Used to reference the initial order line that correspondes to the response. Each order line may only be referenced once. All order lines should be stated.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
1
Rules
Identifier/Error message Flag
BII2-T76-R034
An order response line MUST contain a reference to its corresponding order line.
fatal