From 1 January 2022, a new format is required for SAT v4.0 cancelación documents as per Actualización Factura electrónica - Reforma Fiscal 2022.
The signing mechanism for cancellation documents (XML-DSIG) is different from that used for CFDi documents and is not provided in FirmaSAT. However, you can use our other CryptoSys tools to create a Cancellation document.
See How to create a SAT Cancelacion document using CryptoSys PKI Pro and SC14N.
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This page last updated 3 February 2022