I was trying to add some fields to my new module which contains 5 classes 2 of them inherit from custom modules ( product.template/res.partner) those classes are related with relational fields, I have tried so many ways to make it work and correct many errors but now stuck with this one  

ParseError: "Invalid view definition

details of error :
the field `date_intv` doesn't existe 

Contexte de l'erreur :
Vue `intervention.form`
[view_id: 2592, xml_id: n/a, model: c.intervention, parent_id: n/a]
None" while parsing file:///C:/Program Files (x86)/Odoo 9.0-20151125/server/openerp/addons/Gestion_CVT/fileds_intervention.xml:5, near
<record model="ir.ui.view" id="intervention_form">
                <field name="name">intervention.form</field>
                <field name="model">c.intervention</field>
                <field name="type">form</field>
                <field name="arch" type="xml">
                    <form string="formulaire">
                        <field name="type_int"/>
                        <field name="properties4"/>
						<field name="date_intv"/>
                    </form>
                </field>
            </record>

manchening also that I have already used the osv.osv but didn't work with the equipement class because I was adding class by class  so  now I changed them all to models.Model  so here is my .py file

# -*- coding: utf-8 -*-
from openerp import models, fields, api
class centre(models.Model):
    _name = 'res.partner'
    _inherit = ['res.partner']
	
    rs_ctr = fields.Char(string='Réseau')
    nb_ligne = fields.Integer(string='Lignes')
    n_agr = fields.Integer(string='N° d\'agrèment')
    chef = fields.Char(string='Chef centre')
    prp = fields.Char(string='Propriétaire')
    equipement_id = fields.Many2one('c.intervention','Interventions',select=True,required=True)
    properties1 = fields.One2many('product.template','centre_id','Centres')
	
centre() 
class equipement(models.Model):
    _name = 'product.template'
    _inherit = ['product.template']
    name = fields.Char(string='Nom')
    num_ligne = fields.Integer(string='N° ligne')
    model_mat = fields.Char(string='Model de materiel')
    centre_id = fields.Many2one('res.partner','Centres',select=True) 
    marque_id = fields.Many2one('c.marque','Marques',select=True)
    properties2 = fields.One2many('c.eptinv','equipement_id','Equipements')
equipement()	
class marque(models.Model):
    _name = 'c.marque'
    _description = 'Marques' 
    
    name = fields.Char(string='Nom')
    nom_four = fields.Char(string='Fournisseur')  
    properties3 = fields.One2many('product.template','marque_id','Marques')
marque()
class intervention(models.Model):
    _name = 'c.intervention'
    STATE_SELECTION =  [('c','Corrective'),('p','Préventive')]
    _description = 'Interventions'
    
    name = fields.Char(string='Nom')
    type_int = fields.Selection(STATE_SELECTION,'Type d\'intervention')
    properties4 = fields.One2many('c.eptinv','intervention_id','Interventions')
    
intervention()		
class eptinv(models.Model):
    _name = 'c.eptinv'
    
    _description = 'EptInv' 
  
    date_intv = fields.Date(string='Date d\'intervention')
    equipement_id = fields.Many2one('product.template','Equipements')  
    intervention_id = fields.Many2one('c.intervention','Interventions')
	
eptinv()