Hi guys,

I've been trying a few things to add a new field into a Many2one through xpath but I'm not sure why its not working. My model code:

 class aa_test(models.Model):
    _inherit = 'sale.order'
    hoogte = fields.Integer()
    breedte = fields.Integer()
    aantal = fields.Integer()

My view (xml):

 <openerp>
    <data>
        <record id="sale.view_order_form_inherit" model="ir.ui.view">
            <field name="name">sale.order.form.inherit</field>
            <field name="model">sale.order</field>
            <field name="inherit_id" ref="sale.view_order_form"/>
 	    <field name="arch" type="xml">
		<xpath expr="//field[@name='order_line']" position="inside">
                    <field name="hoogte"/>
		</xpath>
	    </field>
        </record>
    </data>
</openerp>

en I change the position="inside" to position="before" I will see the field showing up before my One2many, when I put it on inside it wont be added to the One2many. I'm adding to the view under sales > Quotations to the One2many order_line. See this example image to see what I want.

Why is the before working but not the inside? Is my xpath expressions invalid?

Thanks,
Yenthe