I want to inherit the form view of product_temlpate in a new view "centre_view" 

here is my.py file:

class centre(osv.osv):
    _name = 'cvt.centre'
    _description = '_Centre' 
	_inherit= 'product_template'
    _columns = {
        'name':fields.char('Nom_Centre', required=True)
 }

and the xml file

<?xml version="1.0"  encoding="utf-8"?>
<openerp>
    <data>
            <record model="ir.ui.view" id="view_centre_form">
                <field name="name">centre.form</field>
                <field name="model">cvt.centre</field>
		<field name="inherit_id" ref="product.product_template_form_view"/>
                <field name="arch" type="xml">
                  <form string="Product">
                     <field name='name'/>
                  </form>
                </field>
            </record>
            <record model="ir.ui.view" id="view_centre_tree">
                <field name="name">centre.tree</field>
                <field name="model">cvt.centre</field>
		<field name="inherit_id" ref="product.product_template_tree_view"/>
                <field name="arch" type="xml">
                   <tree string="Product">
                     <field name='name'/>
                   </tree>
                </field>
            </record>
            <record model="ir.actions.act_window.view" id="action_centre_form">
                <field name="sequence" eval="1"/>
                <field name="view_mode">form</field>
                <field name="view_id" ref="view_centre_form"/>
                <field name="act_window_id" ref="action_my_model_template"/>
            </record> 	
            <record model="ir.actions.act_window.view" id="action_centre_tree">
                <field name="sequence" eval="1"/>
                <field name="view_mode">tree</field>
                <field name="view_id" ref="view_centre_tree"/>
                <field name="act_window_id" ref="action_centre"/>
            </record>     
	</data>
</openerp>		
ParseError: "Invalid view definition

Details of error :
the field `warranty` doesn't existe
so 'warranty' is in the parente view 
what could be wrong please?why new view doesn't show??