stock-logistics-warehouse/stock_reserve/view/product.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="0">
    
        <record model="ir.ui.view" id="product_template_form_view_reservation_button">
            <field name="name">product.template.reservation.button</field>
            <field name="model">product.template</field>
            <field name="inherit_id" ref="product.product_template_only_form_view"/>
                <field name="arch" type="xml">
                <xpath expr="//div[@name='button_box']" position="inside">
                    <button class="oe_inline oe_stat_button" name="action_view_reservations"
                        type="object" groups="base.group_sale_salesman" icon="fa-lock">
                        <field string="Stock Reservations" name="reservation_count" widget="statinfo" />
                    </button>
                </xpath>
            </field>
        </record>

        <record model="ir.ui.view" id="product_product_form_view_reservation_button">
            <field name="name">product.template.reservation.button</field>
            <field name="model">product.product</field>
            <field name="inherit_id" ref="product.product_template_form_view"/>
            <field name="arch" type="xml">
                <xpath expr="//div[@name='button_box']" position="inside">
                    <button class="oe_inline oe_stat_button" name="action_view_reservations"
                        type="object" groups="base.group_sale_salesman" icon="fa-lock">
                        <field string="Stock Reservations" name="reservation_count" widget="statinfo" />
                    </button>
                </xpath>
            </field>
        </record>
    </data>
</openerp>