# CRP20121

Source: https://xmlvalid.com/rules/CRP20121

> El campo Descuento no se debe registrar en el CFDI.

- Level: error
- Rule sets: SAT validations of CFDI 4.0 and Pagos 2.0 Matrices of 25 March 2026 and Pagos 2.0 rev. B
- Context: `/cfdi:Comprobante[@TipoDeComprobante = 'P']/cfdi:Conceptos/cfdi:Concepto`
- Test: `not(@Descuento)`

In English: The Concepto of a payment receipt has no Descuento.

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