# VF-1292

Source: https://xmlvalid.com/rules/VF-1292

> El HASH no es alfanumérico.

- Level: error
- Rule sets: VERI*FACTU checks of the AEAT Validaciones 1.2.2 (8 April 2026)
- Context: `/*:RegFactuSistemaFacturacion/*:RegistroFactura/*:RegistroAlta`
- Test: `matches(normalize-space(*:Huella), '^[A-Za-z0-9]*$')`

> El HASH no es alfanumérico.

- Level: error
- Rule sets: VERI*FACTU checks of the AEAT Validaciones 1.2.2 (8 April 2026)
- Context: `/*:RegFactuSistemaFacturacion/*:RegistroFactura/*:RegistroAnulacion`
- Test: `matches(normalize-space(*:Huella), '^[A-Za-z0-9]*$')`

In English: The fingerprint (Huella) may only have letters and digits.

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