Delegado a invoice

models/res_currency.py

-# -*- coding: utf-8 -*-
-from openerp import fields, models, api, _
-
-class ResCurrency(models.Model):
-    _inherit = 'res.currency'
-    
-    code = fields.Char(
-            string="Código",
-        )
-    abreviatura = fields.Char(
-            string="Abreviatura",
-        )

views/res_currency.xml

-<?xml version="1.0" encoding="utf-8"?>
-<odoo>
-  <!-- Inherit Form view -->
-  <record id="currency" model="ir.ui.view">
-    <field name="name">currency.form</field>
-    <field name="model">res.currency</field>
-    <field name="inherit_id" ref="base.view_currency_form"/>
-    <field name="arch" type="xml">
-      <field name="rate" position="after">
-        <field name="code" />
-        <field name="abreviatura" />
-      </field>
-    </field>
-  </record>
-</odoo>