Electronic invoices with UBL/CII - UNECE payments

This module connects the UNECE payment means codes (a standard list of payment methods used in electronic invoicing) with Odoo's electronic invoice import and export.

When you export an invoice as a UBL or CII XML file, the payment method configured on the invoice is translated into its UNECE code and written into the electronic document. This works for both UBL (including BIS3) and CII formats.

When you import a supplier invoice from an XML file, the module reads the payment means code from the document. If it finds a code that matches an outbound payment method configured in your system, it automatically sets that payment method as the preferred one on the created invoice. This is useful for SEPA direct debit: you immediately see that the invoice will be paid by direct debit and you don't need to pay it manually.

The module also adds two outbound payment methods: 'Direct Debit to suppliers' and 'SEPA Direct Debit to suppliers', each linked to the corresponding UNECE code. These are available in the payment method configuration.

It works together with the standard electronic invoicing features and the UNECE payment means module. No new menus or screens are added; the changes appear in the existing invoice form and payment method settings.