CRP20111
Solo debe existir un Concepto en el CFDI.
In English A payment receipt has exactly one Concepto.
error: the document is invalid
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
Context
/cfdi:Comprobante[@TipoDeComprobante = 'P' or cfdi:Complemento/pago20:Pagos]
Test
count(cfdi:Conceptos/cfdi:Concepto) = 1
Checked with CFDI 4.0