<?xml version="1.0" encoding="UTF-8"?>
<odoo>

    <record id="view_partner_form" model="ir.ui.view">
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form"/>
        <field name="arch" type="xml">
            <group name="sale" position="inside">
                <field
                        name="default_sale_discount"
                        attrs="{'invisible': ['|', ('customer', '=', False), ('parent_id', '!=', False)]}"
                        groups="sale.group_discount_per_so_line"
                />
            </group>
        </field>
    </record>

</odoo>