KSEF-BUS-139 BEST PRACTICE Error KSeF Guard Only
Duplicate invoice line items
Zduplikowane wiersze faktury
Problem
Invoice contains identical lines (same description P_7, VAT rate, unit price, and quantity). This may indicate an accidental line duplication.
How to Fix
Check the invoice lines — merge duplicate lines into a single item with the appropriate quantity, or differentiate descriptions (e.g., add batch number or delivery date).
Source Reference
Brochure FA(3), Section FaWiersz
Page 88
Source Quote
“Invoice lines with identical product descriptions, rates, quantities, and unit prices should be merged into a single line.”
Description
SHA-256: 225d46e2a517…
Justification
BUSINESS LOGICLegal Basis Chain
1
Name of goods or services
Nazwa towaru lub usługi
“7) the name (type) of goods or service;”
VAT Act, Art. 106e sec. 1 point 7 (Page 124)
2
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)