CFDI40210
El valor del campo Importe correspondiente a Retención debe tener hasta la cantidad de decimales que soporte la moneda.
In English The Importe of a withholding in the summary has more decimals than the currency takes.
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/cfdi:Impuestos/cfdi:Retenciones/cfdi:Retencion
Test
mx:places(@Importe) le $d
Checked with CFDI 4.0