# VF-1259

Source: https://xmlvalid.com/rules/VF-1259

> En el bloque Generador si se identifica mediante NIF, el NIF debe estar identificado y ser distinto del NIF ObligadoEmision.

- Level: error
- Rule sets: VERI*FACTU checks of the AEAT Validaciones 1.2.2 (8 April 2026)
- Context: `/*:RegFactuSistemaFacturacion/*:RegistroFactura/*:RegistroAnulacion`
- Test: `not(*:Generador/*:NIF) or normalize-space(*:Generador/*:NIF) != $issuer`

In English: Generador identified by NIF must be another person than the taxpayer in the header.

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