# XV-PL-01

Source: https://xmlvalid.com/rules/XV-PL-01

> KSeF rejects an invoice with an XML processing instruction (…); leave out instructions such as xml-stylesheet (KSeF 2.0, weryfikacja faktury).

- Level: error
- Rule sets: KSeF and FA(3) checks KSeF 2.0 invoice verification (9 April 2026), FA(3) information sheet (August 2026)
- Context: `/`
- Test: `empty(//processing-instruction())`

Validate a document against these rules: https://xmlvalid.com/validate