415: Invoice with an attachment not accepted
What it means
KSeF invoice status 415 means KSeF could not accept the invoice because it has an attachment.
The usual cause
KSeF accepts invoices with attachments only in a batch session, and only after the option has been reported in the e-Urząd Skarbowy service. The one exception is a technical correction of an offline invoice, which may be sent in an interactive session.
How to fix it
Report the attachment option in e-Urząd Skarbowy if that has not been done, and send the invoice in a batch session, or send it without the Zalacznik section if the invoice does not need it.
Elements the check reads
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Zalacznik
The code as published
Brak możliwości wysyłania faktury z załącznikiem Read the official document . Source: KSeF API 2.0, specyfikacja OpenAPI (open-api.json), version 2.9.0, published by Ministerstwo Finansów, read on 8 November 2026.
Look at your file
Open the invoice in your browser to find the fields this code names: Open a Polish KSeF invoice. Open a Polish KSeF invoice