Odoo10 xpath inherit field on purchase order line

Odoo10 xpath inherit field on purchase order line

I'm trying to code on module.

I'm trying to code on module.

but i'm stuck. it doesn't work.

Python code

class PurchaseCurrency(models.Model):
    _inherit = "purchase.order.line"

new_currency = fields.Float(string="Test")

my xml

<record id="new_currency_line" model="ir.ui.view">
        <field name="name">purchase.order.form</field>
        <field name="model">purchase.order</field>
        <field name="inherit_id" ref="purchase.purchase_order_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='order_line']/tree/field[@name='product_qty']" position="after">
                <field name="new_currency"/>

and error warning

ParseError: "Error while validating constraint

Field new_currency does not exist

Error context:

anyone can help me?

python xml

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