Add traking on some import product fields

stock_usability/__init__.py

@@ -2,3 +2,4 @@
 
 from . import stock
 from . import procurement
+from . import product

stock_usability/product.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+# © 2016 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openerp import models, fields
+
+
+class ProductTemplate(models.Model):
+    _inherit = 'product.template'
+
+    track_all = fields.Boolean(track_visibility='onchange')
+    track_incoming = fields.Boolean(track_visibility='onchange')
+    track_outgoing = fields.Boolean(track_visibility='onchange')
+    sale_delay = fields.Float(track_visibility='onchange')