stock-logistics-warehouse/scrap_reason_code/views/stock_move_views.xml

<!-- Copyright 2019 Open Source Integrators
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo>
    <record id="stock_reason_code_form" model="ir.ui.view">
        <field name="name">stock.reason.code.form</field>
        <field name="model">stock.move</field>
        <field name="inherit_id" ref="stock.view_move_form" />
        <field name="arch" type="xml">
            <xpath expr="//group[@name='origin_grp']" position='after'>
                <field name="scrapped" invisible="1" />
                <group
                    string="Reason Code"
                    attrs="{'invisible': [('scrapped', '!=', True)]}"
                >
                    <field name="reason_code_id" />
                </group>
            </xpath>
        </field>
    </record>
</odoo>