I has a moudle that inherit stock.packing and also has a custom field name cw_inventory_ref.

if I write my code like this,

<xpath expr="//field[@name='partner_id']" position="after">
                      <field name="cw_inventory_ref"/>

</xpath>  

the cw_inventory_ref is appeared after parent_id.

I don't want like this.

I want cw_inventory_ref to appeared in front of parent_id.

for example, [data of cw_inventory_ref]data of parent_id.

So, I write my code as following but it doesn't work,

in xml file:

        <record id="cw_stock_picking_tree_view" model="ir.ui.view">
                <field name="name">cw_stock_picking_tree_view</field>
                <field name="model">stock.picking</field>
                <field name="inherit_id" ref="stock.vpicktree"></field>
                <field name="arch" type="xml">                 
                    <xpath expr="//field[@name='partner_id']" position="replace">
                      [<field name="cw_inventory_ref"/>]<field name="partner_id"/>
                    </xpath>                                     
                </field>
        </record>

In .py file:

# -*- coding: utf-8 -*-

from odoo import models, fields, api

class cw_update(models.Model):
    _inherit = 'stock.picking'
    cw_inventory_ref = fields.Char(string=' Internal Reference ',related = "partner_id.ref",readonly=True)  
How can I fix this?Thank you.