hello everyone , i'm trying to customize the Sales Management module ... Actually i've already created another module where i can manage a list of patients , i want in my Sales Management module to put a list of patients in the place of customers ...

i tried this :

ventes.py

# -*- coding: utf-8 -*-
##############################################################################

##############################################################################
from osv import fields,osv
import time
from datetime import datetime
from tools.translate import _

class ventes(osv.osv):
    _name = 'sale.shop'
    _inherit='sale.shop'
    _columns = {
      'prenom': fields.many2one('patient','Patient', required=True),
    }
ventes()

in ventes_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
    <record model="ir.ui.view" id="view_sales_inherit">
        <field name="name">sale.order.tree.inherit</field>
        <field name="model">sale.order</field>
        <field name="type">form</field>
        <field name="inherit_id" ref="sale.view_order_form">form</field>
        <field name="arch" type="xml">
            <field name="name" position="after">
                <label for="prenom" class="oe_edit_only"/>
                <h1><field name="prenom"/></h1>
            </field>

            <field name="partner_id" position="replace"/>
        </field>
    </record>   
 </data>
</openerp>

when i install the module i get this error while i want to create a new sale Order :

View error

Can't find field 'prenom' in the following view parts composing the view of object model 'sale.order':
* sale.order.tree.inherit

Either you wrongly customized this view, or some modules bringing those views are not compatible with your current data model