KSEF-BUS-197 HEURISTIC Warning KSeF Guard Only
Invoice issued on weekend
Faktura wystawiona w weekend
Problem
The invoice has an issue date (P_1) falling on a weekend (Saturday or Sunday). Weekend issuance is rare and may indicate a date entry error or an automated process.
How to Fix
Check the invoice issue date — invoices are usually issued on business days. If the date is correct, this may be justified by a special business process.
Source Reference
KSeF Guard heuristic (weekend invoice issuance — gateway validation practice)
Source Quote
“Invoice issuance on weekends (Saturday, Sunday) is unusual and may indicate a date entry error or automated process without human review.”
Description
SHA-256: ff9d153bec86…
Justification
BUSINESS LOGICLegal Basis Chain
1
KSeF Guard heuristic — weekend issuance
KSeF Guard heurystyka — wystawianie w weekend
“[KSeF Guard heuristic] BUS-197 has no direct basis in the VAT Act — Art. 106i regulates the issuance deadline (by the 15th of the month) but does not distinguish business days from weekends. The rule is an operational heuristic that enforces the practical pattern of issuing invoices on business days — a weekend issuance often signals a date error or an uncontrolled automated process.”
KSeF Guard heuristic (business-day issuance pattern)