flectra/addons/purchase/views/stock_views.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
        <record id="stock_move_purchase" model="ir.ui.view">
            <field name="name">stock.move.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="inside">
                    <field name="purchase_line_id"/>
                </xpath>
            </field>
        </record>

        <record id="view_warehouse_inherited" model="ir.ui.view">
            <field name="name">Stock Warehouse Inherited</field>
            <field name="model">stock.warehouse</field>
            <field name="inherit_id" ref="stock.view_warehouse"/>
            <field name="arch" type="xml">
                 <xpath expr="//field[@name='default_resupply_wh_id']" position="before">
                    <field name="buy_to_resupply" />
                </xpath>
            </field>
        </record>
        
        <!-- Purchase button on orderpoints -->

        <record id="view_warehouse_orderpoint_purchase_form" model="ir.ui.view">
            <field name="name">stock.warehouse.orderpoint.purchase.form</field>
            <field name="model">stock.warehouse.orderpoint</field>
            <field name="inherit_id" ref="stock.view_warehouse_orderpoint_form"/>
            <field name="arch" type="xml">
                <div name="button_box" position="inside">
                    <button name="%(purchase.purchase_order_action_generic)d" type="action" 
                        string="Purchases" class="oe_stat_button" icon="fa-refresh"
                        domain="[('orderpoint_id','=',active_id)]"/>
                </div>
            </field>
        </record>

</flectra>