Sale Payment Term Security

This module adds a permission check to the sale order form so that payment terms cannot be freely edited by everyone.

• On the sale order form, the Payment Terms field becomes read-only for users who do not belong to the group "Enable to manage payment terms".
• Users who do have that permission keep working as usual and can still select or change the payment terms.
• The restriction is applied when the form is displayed, so it affects both the screen and any attempt to modify the value from that form.
• The module builds on the sale application and on the base payment term security module, so the same permission concept is shared between sales and accounting.

It does not add new menus, reports, automated emails or scheduled actions. It only changes the behaviour of the existing sale order form field payment_term_id on the sale.order model.