On April 29, 2022, the Mexican government announced that the issuance of the Digital Tax Receipt (CFDI) with the Complemento Carta Porte (Complemento Waybill or CCP) for foreign trade operations is mandatory for all modes of transportation effective January 1, 2022, but the transition period is extended through September 30, 2022. The CCP supports the movement of goods within Mexico and provides temporary legal custody to carriers. Entry into force was the following day of publication.
The notice can be found here: https://www.dof.gob.mx/nota_detalle.php?codigo=5650603&fecha=29/04/2022