BR-CO-20
EN 16931-1 layer: en16931
Checked against Peppol BIS Billing 3.0 2026.5
What does BR-CO-20 mean? If Invoice line period (BG-26) is used, the Invoice line period start date (BT-134) or the Invoice line period end date (BT-135) shall be filled, or both.
Why did my invoice fail BR-CO-20?
If an Invoice line period (BG-26) is used, the Invoice line period start date (BT-134) or end date (BT-135) must be present (one or both). As with the document-level period, a line-level period group must carry at least one date to be meaningful.
Official rule text
If Invoice line period (BG-26) is used, the Invoice line period start date (BT-134) or the Invoice line period end date (BT-135) shall be filled, or both.
Common causes
- cac:InvoiceLine/cac:InvoicePeriod present but StartDate and EndDate both missing.
- Line period wrapper always generated even when the line has no service period.
- Only one date intended but the wrong (empty) element rendered.
- Period set at document level but an empty duplicate emitted on the line.
How do I fix it?
On the line, set at least one date: <cac:InvoicePeriod><cbc:StartDate>2026-06-01</cbc:StartDate></cac:InvoicePeriod>, or remove the line-level InvoicePeriod if not applicable.
Related rules
BR-CO-03 · BR-CO-04 · BR-CO-05 · BR-CO-06 · BR-CO-07 · BR-CO-08 · BR-CO-09 · BR-CO-10
Check your invoice against this rule
Paste it into the live demo, or call POST /v1/validate. See the quickstart.