CFDI40169
El valor del campo Descuento es mayor que el campo Importe.
In English A line's Descuento must not be more than its Importe.
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:Conceptos/cfdi:Concepto
Test
not(@Descuento) or mx:dec(@Descuento) le mx:dec(@Importe)
Checked with CFDI 4.0