[19.0][ADD] account_early_payment_base, account_customer_early_payment_discount: early payment discount granted to customers settled by a credit note task#30881

[alan196]

New module account_customer_early_payment_discount, on top of account_early_payment_base.

Includes account_early_payment_base and the refactor of account_supplier_early_payment_discount on top of it (already merged here as #11), mirroring the OCA PRs OCA#978 (base), OCA#976 (supplier) and OCA#977 (customer).

Companies that grant their customers a discount for paying within a few days often settle it with a credit note: a fiscal document the customer books and, in countries like Mexico, the only way to report a discount granted after the invoice was issued. The native early payment discount of the payment terms writes the discount off when the payment is registered, counts calendar days and applies the same percentage to the whole invoice.

This module keeps the percentage and the days of the payment terms and adds, on the payment terms:

• Settle with a Credit Note: the native write-off is switched off, the customer owes the full amount, and the discount is granted with a credit note applied to the invoice once the customer pays the discounted amount in time. The payment receipt then reports what was really collected.
• Count Business Days: the days to pay within are counted on the working calendar of the company, skipping weekends and holidays.
• On Goods Only: the discount leaves out the services of the invoice (freight, insurance...).

On the customer invoice: the last day to pay, the amount of the discount, the Early Payment to Apply filter once the customer paid in time, and the Apply Early Payment button, which creates a draft credit note with the eligible lines and their taxes. The credit note is left in draft so any approval flow of the company (for example account_move_tier_validation) can gate it, and it is reconciled with the invoice as soon as it is posted.

account.move._early_payment_paid_on_time() and account.move._early_payment_eligible_lines() are the extension points. The fields on account.move, the button and the business day helpers live in account_early_payment_base, shared with account_supplier_early_payment_discount.

🤖 Generated with Claude Code

[jarsabot]

Linked to Odoo task #30881