Poland (FA(3)): Universally Unique Identifier

For Polish KSeF FA(3) invoices that are picked up from the KSeF platform, the KSeF Number will be provided in the cbc:UUID element.

The KSeF number is a unique, system-generated identification number assigned to every structured invoice once it has been successfully accepted.

For outbound invoices, this field cannot be populated at the time of issuance because the KSeF number is not generated until the invoice is successfully uploaded and processed by the government platform.

Element

Example

<ubl:Invoice>
    <!-- code omitted for clarity -->
    <cbc:UUID schemeID="VRBL:PL:NrKSeF">3010912976-20260111-02004011DD86-F1</cbc:UUID>
    <!-- code omitted for clarity -->
</ubl:Invoice>