The issue date of an invoice is required by EU directives as well as country laws. An invoice must therefore contain the date on which it was issued. Format YYYY-MM-DD.

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Rules
Identifier/Error message Flag
BII2-T10-R004
An invoice MUST have an invoice issue date
fatal
NONAT-T10-R009
Issue date of an invoice should be today or earlier.
warning