<?xml version="1.0"?>
<tree string="Purchase Order Lines" create="false">
                    <field name="order_id"/>
                    <field name="name"/>
                    <field name="partner_id" string="Vendor"/>
                    <field name="product_id"/>
                    <field name="price_unit"/>
                    <field name="product_qty"/>
                    <field name="product_uom" groups="uom.group_uom"/>
                    <field name="price_subtotal" widget="monetary"/>
                    <field name="currency_id" invisible="1"/>
                    <field name="date_planned" widget="date"/>
                </tree>
            