What it means
The due date (BT-9) given as the payment due date in the payment details must be exactly 10 characters in the form YYYY-MM-DD, and it must be a date that exists. This is the element where a UBL credit note carries its due date, while BR-RO-DT003 covers the due date element used on invoices. 2026-12-05 passes, while 05/12/2026, 2026-12-5, 2026-12-05T00:00:00 and 2026-11-31 fail.
Why it matters
The due date tells the buyer when to pay. If the system cannot read it as a date, it cannot accept the document, so it is rejected.
How to fix it
Open the payment details of the credit note and check the payment due date, or due date, in your software. Make sure it holds a real date and that the e-invoice export writes it as year-month-day with hyphens, with no time or time zone. If invoices pass but credit notes fail, ask your software supplier to check the credit note export, because it writes the date in a different element.
The rule as published
Un element de tip data (BT-9) trebuie sa respecte formatul YYYY-MM-DD #A date (BT-9) MUST be formatted YYYY-MM-DD. ( = ' … ') Business terms: BT-9
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-DT003_CN still fails, and which other rules do.