eiru_set_dependencies/models/res_company.py

from openerp import models,fields

class ResCompany(models.Model):
    _name = 'res.company'
    _inherit = 'res.company'

    company_ruc = fields.Char('R.U.C.')
    legal_agent = fields.Char('Representante Legal')
    agent_ruc = fields.Char('RUC del representante')
    exportador = fields.Selection([('SI','SI'),('NO','NO')], string='Exportador')
    juridico = fields.Boolean('Persona Juridica')