hi all, inherited " res.partner " and added a page (editable tree) in notebook section, but when clicking on "Add a line" it is showing below error: 

ValueError: Invalid field 'same_vat_partner_id' on model 'tests.users'

my  model 'tests.users' have no field with this invalid field named 'same_vat_partner_id' or i am missing what odoo trying to communicate? 

class Users(models.Model):
    _name = 'tests.users'
    _rec_name = 'name'
    _description = "Tests Users"
    name = fields.Char(string="User Name", required=True)
    email = fields.Char(string="Email")
    email_verified_at = fields.Datetime(string="Email Verified At")
    address = fields.Text(string="User Address")
    password = fields.Char(string="Password", required=True)
    profile_picture = fields.Binary()
    phone = fields.Char(string="Phone No.", required=True)
    type = fields.Selection([
        ('staff', 'Staff'),
        ('customer', 'Customer'),
        ('rider', 'Rider')
    ], required=True, string="User Type", default='staff')
    remember_token = fields.Char(string="Remember Token")
    zone_id = fields.Many2one("tests.zones", string="Zone")
    description = fields.Text(string="Other Information")
    deleted_at = fields.Datetime()
    user_ids = fields.One2many('tests.userzones', 'user_id', string="User Zone")

and didn't used this model in any means when inherited res.partner... please help to resolve the problem.

for reference, my model and view files are as below for inheritance:

class PartnerZone(models.Model):
    _inherit = 'res.partner'
    zone_id = fields.Many2one('tests.zones', string="Zone")
    user_mids = fields.One2many('tests.usermetas', 'user_id', string="User Metas")
    user_wids = fields.One2many('tests.userwallets', 'user_id', string="User Wallets")

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <record id="view_res_partner_form_inherit" model="ir.ui.view">
        <field name="name">Contacts Custom Fields</field>
        <field name="model">res.partner</field>
        <field name="type">form</field>
        <field name="inherit_id" ref="base.view_partner_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='category_id']" position="after">
                <field name="zone_id" string="Zone"/>
            </xpath>
            <!-- added below code for editable tree in contacts form -->
            <xpath expr="//page[@name='sales_purchases']" position="after" >
                <page string="Wallets">
                    <field name="user_wids">
                        <tree editable="bottom" string="User Wallets">
                            <field name="amount"/>
                            <field name="credits"/>
                            <field name="description"/>
                        </tree>
                    </field>
                </page>
            </xpath>
        </field>
    </record>
</odoo>

regards