# XV-FI-11

Source: https://xmlvalid.com/rules/XV-FI-11

> A secure invoice (…) needs InvoiceClassification/ClassificationCode; unless agreed otherwise it may be the same as InvoiceTypeCode (Finvoice 3.0 guidelines, 10.5).

- Level: error
- Rule sets: Finvoice 3.0 calculation and payment rules Implementation guidelines 2.6 (16 September 2025)
- Context: `/Finvoice/InvoiceDetails[matches(InvoiceTypeCode, '^SEI0[12]$')]`
- Test: `normalize-space(InvoiceClassification/ClassificationCode) != ''`

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