CFDI40197

El valor del campo ValorUnitario debe ser mayor que cero (0).

In English The ValorUnitario of a part (Parte) must be more than zero.

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:Concepto/cfdi:Parte
Test
not(@ValorUnitario) or mx:dec(@ValorUnitario) gt 0

Checked with CFDI 4.0