Skip to content
KSEF-BUS-070 BEST PRACTICE Warning KSeF Guard Only

Invoice line numbers must be unique (gaps allowed, corrections exempt)

Numery wierszy faktury muszą być unikalne (luki dozwolone, korekty pominięte)

Problem

Duplicate invoice line number (NrWierszaFa) detected. Each line must have a unique number. This rule does not apply to correction invoices.

How to Fix

Check the line numbering on the invoice — each line (FaWiersz) must have a unique number (NrWierszaFa). Gaps in numbering are allowed.

Source Reference

Brochure FA(3): Kolejny numer wiersza faktury

Page 89

View source PDF

Source Quote

“Invoice line numbers (NrWierszaFa) must be unique within a document. The rule does not apply to correction invoices, where duplicate NrWierszaFa values are normal (before/after blocks).”
Description SHA-256: f619debe49e5…

Justification

BUSINESS LOGIC

Legal Basis Chain

1

Invoice line number

Numer wiersza faktury

“Consecutive invoice row number The consecutive row number of the invoice is specified.”
Brochure FA(3), Section NrWierszaFa (Page 89)