eiru_service_carworkshop/model/project_service.py

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

from openerp import models, fields, api
from openerp.exceptions import except_orm, Warning, RedirectWarning

class ProjectServiceCarWorkShop(models.Model):
    _inherit = 'project.service'

    agent_id = fields.Many2one('res.partner', string='Agente de Seguro')
    policy = fields.Boolean(string="Policy")

    @api.one 
    @api.onchange('name')
    def onchange_name(self):
        self.partner_id = self.name.partner_id.id
        self.agent_id = self.name.agent_id.id
        self.policy = self.name.policy