Mexico SAT Reference

This module provides three reference tables required by the Mexican tax authority (SAT) for electronic documents. It does not create invoices or sign documents; it only stores the official code lists.

• Receipt Types: the kind of CFDI (Income, Expense, Transfer, Payroll, Payment), each with a code and validity dates.
• Receipt Uses: the reason for a receipt (e.g., general expenses, medical fees), with a code and flags indicating whether it applies to individuals (natural persons) and/or companies (moral persons).
• Relation Types: how a document relates to previous ones (credit note, debit note, return, substitution, etc.), with a code and validity dates.

All three lists are preloaded with the official SAT codes and dates. Users can view them from the SAT menu under Settings, and can search by description or code. The records are read-only for regular users, so the official values cannot be changed by mistake.

This module only depends on the base module and does not modify sales, purchases, or accounting documents. It is a reference data module meant to be used by other Mexican localization modules.