SAT keeps tightening Carta Porte. Who must issue it, who can skip it, what the most common rejections are — and how to wire it into Odoo without breaking your invoicing flow.

Who needs Carta Porte

Anyone moving goods across Mexican territory by federal road must issue Carta Porte alongside the CFDI. There are exemptions — and a lot of confusion about who falls under them.

The 3 most common rejections

Wrong RFC for the carrier
Mismatched kilometraje between Carta Porte and the actual route
Missing or invalid autotransporte codes

Wiring it into Odoo

The OCA module l10n_mx_edi_carta_porte covers the basics, but you'll likely need custom logic for: multi-leg routes, import-export combinations, and reusable vehicle/operator master data.

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