Permitir vender por menor de un precio y un usuario establecido

__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import models

__openerp__.py

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+# -*- coding: utf-8 -*-
+
+{
+    'name': "Limitar Precio de Venta por precio C",
+    'author': "Sebastian Penayo",
+    'category': 'Sales Management',
+    'version': '8.0.0.1',
+    'depends': ['base','sale'],
+    'data': ['views/restrict_saleprice_c.xml'],
+    'installable':True,
+    'auto_install':False
+}

models/__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import sale_order

models/sale_order.py

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+# -*- coding: utf-8 -*-
+from openerp import models,fields,api,_
+from openerp.exceptions import Warning
+
+class sale_order(models.Model):
+    _inherit = 'sale.order'
+
+    @api.multi
+    def action_button_confirm(self):
+        message1 = ""
+        # moneda = self.env['res.currency.rate'].search([('currency_id', '=', self.currency_id.id)], order ='id')
+        # xrate = moneda[len(moneda) - 1]
+        # xcambio = xrate.rate
+        for xorden in self.order_line:
+            if (xorden.price_unit) < (((xorden.product_id.product_tmpl_id.standard_price*(1+0.40)))) and not self.user_has_groups('sale_restrict_price_c.groups_restrict_price_c'):
+                message1 += "\n Producto "+str(xorden.name)
+                message1 += "\t Precio de Venta ("+str(xorden.price_unit)+")"
+                message1 += "\t Precio mínimo ("+str((xorden.product_id.product_tmpl_id.standard_price*(1+0.40)))+")"
+
+        message = "¡Precio de venta no permitido!\n¡El monto ingresado es menor al precio C establecido!"
+        message += message1
+        if message1:
+            raise Warning(_(message.rstrip()))
+
+        return super(sale_order,self).action_button_confirm()

views/restrict_saleprice_c.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<openerp>
+    <data>
+        <record id="groups_restrict_price_c" model="res.groups">
+            <field name="name">Permitir vender por debajo del precio C</field>
+            <field name="category_id" ref="base.module_category_extra" />
+        </record>
+
+      </data>
+  </openerp>