Point of Sale no longer needs extra country-specific customizations for blocking mixed refund and sales orders, because this behavior is now handled by default. This reduces duplicated logic and helps keep Chilean electronic invoicing and Belgian blackbox POS flows aligned with the standard process.

Community PR Odoo/Odoo#189329 changes the return value of the `PosOrder` method `doNotAllowRefundAndSales` to `true`, so that some patches are no longer relevant.

Community PR: 189329
task-4369388