vracoop_pack_custo/views/product_template_views.xml

<?xml version="1.0" encoding="utf-8"?>

<odoo>
    <record id="product_template_form_view" model="ir.ui.view">
        <field name="name">product.template.pack.form</field>
        <field name="model">product.template</field>
        <field name="inherit_id" ref="product.product_template_form_view"/>
        <field name="arch" type="xml">
            <header position="inside">
                <button string="Récupérer les infos Packs" type="object"
                    name="get_info_parent_pack"
                    attrs="{'invisible': [('pack_ok', '!=', True)]}"/>
            </header>
            <field name="list_price" position="after">
                <field name="list_price_ref_pack" string="Prix produit référent au kg" widget='monetary' options="{'currency_field': 'currency_id', 'field_digits': True}" attrs="{'invisible': [('pack_ok', '!=', True)]}"/>
                <field name="price_ref_pack_compute" string="Prix de vente TTC" widget='monetary' options="{'currency_field': 'currency_id', 'field_digits': True}" attrs="{'invisible': [('pack_ok', '!=', True)]}"/>
            </field>
        </field>
    </record>
</odoo>