BR-CO-20
Error (blocking) EN 16931 (UBL)EN 16931 (CII)
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.
Seeing BR-CO-20 in a rejection?
Run your file through the free validator to see every violation at once — or let NormDrift watch your reference invoices so the next ruleset release never surprises you.