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CFDI40208

Debe haber sólo un registro por cada tipo de impuesto retenido (…).

In English The summary has one Retencion per tax: two withholdings of the same tax must be added together.

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.

SAT validations of CFDI 4.0 and Pagos 2.0 Matrices of 25 March 2026 and Pagos 2.0 rev. B
Context
/cfdi:Comprobante/cfdi:Impuestos/cfdi:Retenciones/cfdi:Retencion
Test
count(../cfdi:Retencion[@Impuesto = $tax]) = 1

Checked with CFDI 4.0