# VF-1130

Source: https://xmlvalid.com/rules/VF-1130

> El campo NumSerieFactura contiene caracteres no permitidos (…).

- Level: error
- Rule sets: VERI*FACTU checks of the AEAT Validaciones 1.2.2 (8 April 2026)
- Context: `/*:RegFactuSistemaFacturacion/*:RegistroFactura/*:RegistroAlta`
- Test: `every $c in string-to-codepoints($number) satisfies ($c ge 32 and $c le 126 and not($c = (34, 39, 60, 61, 62)))`

In English: The invoice number (NumSerieFactura) has characters that are not allowed: only printable ASCII (32 to 126), and not " ' < > =.

## Why it fails

- Accented letters, ñ, the euro sign or typographic quotes in the series or number.

## How to fix it

- Number invoices with letters, digits and simple separators such as - or /.

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