diff --git a/mrp_bom_version/README.rst b/mrp_bom_version/README.rst
new file mode 100644
index 000000000..f66a2b32c
--- /dev/null
+++ b/mrp_bom_version/README.rst
@@ -0,0 +1,18 @@
+MRP - BoM version
+=================
+
+This module performs the following:
+
+1.- In the MRP BoM list object, 2 new fields are added:
+
+    1.1.- Historical Date, of type date.
+    1.2.- Status, of type selection, with these values: draft, in active
+          and historical. This new field has gotten because it has added a
+          workflow to MRP BoM list object.
+
+You can only modify the components and / or production process if it is in
+draft status. The other fields can only be changed if they are not in
+historical state.
+when the MRP BoM list is put to active, a record of who has activated,
+and when will include in chatter/log.
+It also adds a constraint for the sequence field to be unique.
diff --git a/mrp_bom_version/__openerp__.py b/mrp_bom_version/__openerp__.py
index 5f24fba0d..a9b57c916 100644
--- a/mrp_bom_version/__openerp__.py
+++ b/mrp_bom_version/__openerp__.py
@@ -16,32 +16,17 @@
 #
 ##############################################################################
 {
-    "name": "MRP BoM Version",
+    "name": "MRP - BoM Version",
     "version": "1.0",
     "author": "OdooMRP team",
     "category": "Manufacturing",
     "website": "http://www.odoomrp.com",
-    "description": """
-    This module performs the following:
-
-    1.- In the MRP BoM list object, 2 new fields are added:
-
-        1.1.- Historical Date, of type date.
-        1.2.- Status, of type selection, with these values: draft, in active
-              and historical. This new field has gotten because it has added a
-              workflow to MRP BoM list object.
-
-    You can only modify the components and / or production process if it is in
-    draft status. The other fields can only be changed if they are not in
-    historical state.
-    when the MRP BoM list is put to active, a record of who has activated,
-    and when will include in chatter/log.
-    Also creates a constraint for the sequence field to be unique.
-    """,
-    "depends": ['mrp',
-                ],
-    "data": ['data/mrp_bom_data.xml',
-             'views/mrp_bom_view.xml',
-             ],
+    "depends": [
+        "mrp",
+    ],
+    "data": [
+        "data/mrp_bom_data.xml",
+        "views/mrp_bom_view.xml",
+    ],
     "installable": True
 }
diff --git a/mrp_bom_version/models/mrp.py b/mrp_bom_version/models/mrp.py
index 61d2caf86..644e33fe5 100644
--- a/mrp_bom_version/models/mrp.py
+++ b/mrp_bom_version/models/mrp.py
@@ -28,35 +28,32 @@ class MrpBom(models.Model):
         },
     }
 
+    def _get_max_sequence(self):
+        bom = self.search([], order='sequence desc', limit=1)
+        maxseq = bom.sequence + 1
+        return maxseq
+
     historical_date = fields.Date(string='Historical Date', readonly=True)
     state = fields.Selection([('draft', 'Draft'),
                               ('active', 'Active'),
                               ('historical', 'Historical'),
                               ], string='Status', index=True, readonly=True,
                              default='draft', copy=False)
+    sequence = fields.Integer(default=_get_max_sequence)
 
     @api.one
     @api.constrains('sequence')
     def check_mrp_bom_sequence(self):
-        domain = [('id', '!=', self.id), ('sequence', '=', self.sequence)]
-        if self.product_tmpl_id:
-            domain.append(('product_tmpl_id', '=', self.product_tmpl_id.id))
-        else:
-            domain.append(('product_tmpl_id', '=', False))
-        if self.product_id:
-            domain.append(('product_id', '=', self.product_id.id))
-        else:
-            domain.append(('product_id', '=', False))
-        found = self.search(domain)
-        if found:
+        domain = [('id', '!=', self.id), ('sequence', '=', self.sequence),
+                  ('product_tmpl_id', '=', self.product_tmpl_id.id),
+                  ('product_id', '=', self.product_id.id)]
+        if self.search(domain):
             raise exceptions.Warning(
                 _('The sequence must be unique'))
 
     @api.one
     def copy(self, default=None):
-        bom = self.search([], order='sequence desc', limit=1)
-        maxseq = bom.sequence + 1
-        default.update({'sequence': maxseq})
+        default.update({'sequence': self._get_max_sequence()})
         return super(MrpBom, self).copy(default=default)
 
     @api.multi