Hello everyone. i have an issue. 

I want to override "type" field of original product.template model where original is :

type = fields.Selection([
    ('consu', 'Consumable'),
    ('service', 'Service')], string='Product Type', default='consu', required=True,
    help='A storable product is a product for which you manage stock. The Inventory app has to be installed.\n'
         'A consumable product is a product for which stock is not managed.\n'
         'A service is a non-material product you provide.')

I override field in my custom module by :

class ProductTemplate(models.Model):
    _inherit = 'product.template'

    type = fields.Selection([
        ('project', 'Project')], string='Product Type', default='proje', required=True,
        help='Proje,hizmet,ürün')

But still  Consumable  and Service options are seen in list.  I also replaced view using xpath:

<record id="view_product_newcategory" model="ir.ui.view">
    <field name="name">view.product.newcategory.sap.form.inherited</field>
    <field name="model">product.template</field>
    <field name="inherit_id" ref="product.product_template_only_form_view"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='type']" position="replace">
            <field name="type" ref="custome_fields.type"/>
            <field name="type"/>
        </xpath>
    </field>
</record>

However problem isnt solved. How i should override a field entirely ?