models.py

# coding: utf-8
import re
from openerp import models, fields, api
from openerp.exceptions import ValidationError


class CustomerType(models.Model):

    _name = 'hacom.customer.type'

    name = fields.Char('Nombre', required=True)
    description = fields.Text(u'Descripción')
    attention_time = fields.Integer(u'Tiempo de atención (horas)')


class Partner(models.Model):

    _inherit = 'res.partner'

    contact_type = fields.Selection(selection=[
        ('purchase', 'Cobranza'),
        ('legal', 'Representante Legal'),
        ('support', 'Soporte Técnico'),
        ('user', 'Usuario Sistema')
    ], string='Tipo')