CRP20116

El valor del campo ClaveUnidad debe ser "ACT".

In English The Concepto of a payment receipt has ClaveUnidad ACT.

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']/cfdi:Conceptos/cfdi:Concepto
Test
@ClaveUnidad = 'ACT'

Checked with CFDI 4.0