This update replaces repeated logic with a shared check for early payment discounts in the accounting reconciliation flow. It keeps behavior aligned with the main Odoo codebase and reduces maintenance risk without changing day-to-day user workflows.

This is repeated code from what already exists in odoo community.

OPW-4895365

See: [odoo/odoo#215615](https://github.com/odoo/odoo/pull/215615)