I'm using Odoo v10 and I'm trying to customize existing view (base.view_partner_form). Here are my model and view:

class add_supplier1099(models.Model):
    # _name = 'add.supplier1099'            
    _inherit = ['res.partner']      
    _description = "Add Checkbox and TaxID Field if Supplier Requires 1099"    
    supp_test_field = fields.Char(string="test field")

<odoo>      
    <data>        
        <record id="add_supplier1099_view_inherit" model="ir.ui.view">          
        <field name="name">res.partner.form</field>             
        <field name="model">res.partner</field>         
        <field name="inherit_id" ref="base.view_partner_form"/>         
        <field name="arch" type="xml">              
            <xpath expr="//field[@name='phone']" position="after">                      
                <field name="supp_test_field"/>             
            </xpath>            
        </field>               
        </record>    
    </data>
</odoo>

This code works and it adds "supp_test_field" to the form. But if you uncomment # _name = 'add.supplier1099' (I thinks it should add my new field to an existing table of "res.partner" model) it'll through an error:

ValueError: Can't validate view:
Field `supp_test_field` does not exist

I also tried to go with "_name = res.partner" (I thinks it should create a new table with my new field and fields from res.partner model), but I was getting the same error. Any ideas why i'm getting this error in the above cases and not getting an error when I comment out "_name" attribute?