What it means
The start date of the invoice period (BT-73), or of the period of a single line (BT-134), must be exactly 10 characters in the form YYYY-MM-DD, and it must be a date that exists. 2026-11-01 passes, while 01/11/2026, 2026-11-1, 2026-11-01Z and 2026-04-31 fail, as do spaces around the date. The rule only applies when the invoice or a line gives a period start date.
Why it matters
The period tells the buyer which stretch of time the invoice or line covers. If the system cannot read the start date, the invoice is rejected.
How to fix it
Periods are used when you bill for a stretch of time, such as a month of rent or a subscription. Find the period start on the invoice, or on the line if the period is set per line, and re-enter it as a real date. Then check that the e-invoice export writes it as year-month-day with hyphens, with no time or time zone.
The rule as published
Un element de tip data (BT-73, BT-134) trebuie sa respecte formatul YYYY-MM-DD #A date (BT-73, BT-134) MUST be formatted YYYY-MM-DD. ( = ' … ') Business terms: BT-73, BT-134
Where this rule applies
| Rule set | Version |
|---|---|
| CIUS-RO UBL Invoice 1.0.9 | 1.0.9 |
| CIUS-RO UBL Credit Note 1.0.9 | 1.0.9 |
Check your file
Drop your e-invoice to see whether BR-RO-DT005 still fails, and which other rules do.
Related rules
- BR-RO-DT004 Delivery date must be written as YYYY-MM-DD
- BR-29 The invoicing period cannot end before it starts
- BR-30 A line period cannot end before it starts
- BR-CO-19 An invoicing period needs a start or end date
- BR-CO-20 A line period needs a start or end date
- BR-RO-DT006 Period end date must be written as YYYY-MM-DD