# UBL-CR-520

> A UBL invoice should not include the InvoiceLine InvoicePeriod StartTime

Checked against Peppol BIS Billing 3.0 2026.5

Canonical: https://einvoicecheck.eu/rules/ubl-cr-520

## Official rule text

A UBL invoice should not include the InvoiceLine InvoicePeriod StartTime