odoo/addons/l10n_eu_service/models/eu_service_tax_rate.py

from openerp import fields, models, api

class service_tax_rate(models.Model):
    _name = "l10n_eu_service.service_tax_rate"

    country_id = fields.Many2one('res.country', string='Country')
    rate = fields.Float(string="VAT Rate")