product_product.xml

<odoo>
    <!-- Product View: add description_warehouse -->
    <record id="product_normal_form_view" model="ir.ui.view">
        <field name="name">product.normal.form</field>
        <field name="model">product.product</field>
        <field name="inherit_id" ref="product.product_normal_form_view"/>
        <field name="arch" type="xml">
            <field name="description_purchase" position="after">
                <separator string="Warehouse Description"/>
                <field colspan="4" name="description_warehouse" nolabel="1"/>
            </field>
        </field>
    </record>
</odoo>