HI there,
I am trying to add a "vat " field to the Sales Order model so I will be able to display the vat number in tree view. "vat" field is currently present in Partner / Companies / Users. This is my py code:
from openerp import models, fields
class SaleOrderInherited(models.Model):
_inherit = 'sale.order'
vat = fields.Char(string='vat', related='partner.vat')