- KSeF will not reject invoices due to accounting errors but will block duplicate invoice submissions.
- Invoices will be rejected if they are identical to already submitted ones, submitted by unauthorized persons, or do not comply with the required logical structure.
- If an invoice is rejected, it is considered not issued and will not receive a KSeF number; corrections must be made and the invoice resubmitted.
- KSeF does not allow buyers to approve or reject invoices within the system; any disputes must be resolved outside KSeF.
- KSeF verifies the XML structure and user authorization but does not check for mathematical or accounting errors.
Source: podatki.gazetaprawna.pl
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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