In sales module under products menu i want to add a graph views in it by inheritance option. How to do it?

I am getting error: AssertionError: Element record failed to validate attributes.

Note: I am here to add the graph view in existing menu(sale order) only.

xml file

<record id="view_sale_order_graph" model="ir.ui.view"> 
 <field name="name">view.menu.sale.graph</field>      
 <field name="model">sale.order</field>           
 <field name="arch" type="xml">           
     <graph string="Graphical View">         
       ......
       ......
     </graph>      
 </field>  
 </record>

<!-- action -->

<record id="action_menu_sale_form" model="ir.actions.act_window">   
 <field name="name">sales menu</field>        
 <field name="res_model">sale.order</field>   
 <field name="view_mode">graph</field>    	
 </record>

.py File

class custom_sales(osv.osv):

  _inherit = "sale.order"
custom_sales()