Working on Odoo 10 community.

If I create a computed field:

    quantity_ordered = fields.Float('Quantity Ordered')
    price = fields.Float('Price', help='Item Unit Net Price')
    price_total = fields.Float(string='Total Price', compute='_get_total_price')
        
    @api.one
    def _get_total_price(self):
        self.price_total = self.price * self.quantity_ordered

I can display the price_total value in a form or tree view, but I cannot display it on a pivot as this:

    <record id="dw_purchase_pivot" model="ir.ui.view">
        <field name="name">dw.purchase.pivot</field>
        <field name="model">dw.purchase</field>
        <field name="arch" type="xml">
            <pivot string="Purchase Orders">
                <field name="partner" type="row"/>
                <field name="delivery_date" type="col" />                
                <field name="price_total" type="measure" /> 
            </pivot>
        </field>
    </record>

While price and quantity_ordered are displayed regularly.

The store attribute is not set, but nothing changes if I set store=False

Cannot figure out where I am going wrong, or is there any turnaround for this?