On 20 October, an update of KSeF test application was launched, and users can issue invoices and download the Official Receipt Certificate (UPO – Pl.: Urzędowe poświadczenie odbioru) in PDF format.   Currently, the KSeF platform only supports invoices generated in FA_VAT (a structured XML format). Along with the latest test version, it could also anticipate invoice presentation (human-readable format) becoming one of the options for the VAT payers.   Below is the non-exclusive list of the new features: NIP checksum validation mechanism; Issuance and download of e-invoices and UPOs in PDF format; Flagging the issuance of a duplicate invoice...