The validity period must include both start date and end date, and the start date must be earlier than the end date

Namespace
cac urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2"
Child elements
Card Name Description
1..1 cbc:StartDate

Period start date
The date when the period starts.

Example value: 2017-06-01

1..1 cbc:EndDate

Period end date
The date on which the period ends.

Example value: 2017-06-30

Rules
Identifier/Error message Flag
EUGEN-T68-B01101
Element 'cbc:StartDate' MUST be provided.
fatal
EUGEN-T68-B01102
Element 'cbc:EndDate' MUST be provided.
fatal
EUGEN-T68-B01103
Document MUST NOT contain elements not part of the data model.
fatal
Description

Validity period is mandatory on document level.

UBL example of validity period
<cac:ValidityPeriod>
        <cbc:StartDate>2017-01-01</cbc:StartDate>
        <cbc:EndDate>2017-12-31</cbc:EndDate>
</cac:ValidityPeriod>