diff --git a/pos_margin/README.rst b/pos_margin/README.rst
index f0b79fbf..7717f342 100644
--- a/pos_margin/README.rst
+++ b/pos_margin/README.rst
@@ -1,15 +1,10 @@
-=============================================
-This module adds the 'Margin' on sales order.
-=============================================
-
-
 .. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
    :alt: License: AGPL-3
 
-
-Margin on PoS order
-===================
+====================
+Margin on PoS Orders
+====================
 
 This module extends the functionality of point of sale to support margin on
 pos orders.
@@ -17,16 +12,29 @@ pos orders.
 This gives the profitability by calculating the difference between the Unit
 Price and Cost Price.
 
+Configuration
+=============
+
+this module create a new Decimal precision for the field 'Margin (%)' of the
+pos.order model, with two digits, by default. you can change the precision,
+going to 'Settings' / 'Technical' / 'Database Structure' / 'Decimal Accuracy'
+
 
 Usage
 =====
 
 To use this module, you need to:
 
-#. Go to 'Point Of Sale' / 'Daily Operations' / 'Orders'
-#. Open an order
+* Go to 'Point Of Sale' / 'Daily Operations' / 'Orders'
+
+* View Orders
+
+.. figure:: static/description/pos_order_tree_view.png
+   :width: 800px
+
+* Open an Order
 
-.. figure:: ./pos_margin/static/description/pos_order_form.png
+.. figure:: static/description/pos_order_form_view.png
    :width: 800px
 
 .. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
diff --git a/pos_margin/__init__.py b/pos_margin/__init__.py
index 402ac47e..385d3cad 100644
--- a/pos_margin/__init__.py
+++ b/pos_margin/__init__.py
@@ -1,2 +1,3 @@
 # -#- coding: utf-8 -#-
 from . import models
+from .hooks import pre_init_hook
diff --git a/pos_margin/__openerp__.py b/pos_margin/__openerp__.py
index 44a2f678..07e5f0a1 100644
--- a/pos_margin/__openerp__.py
+++ b/pos_margin/__openerp__.py
@@ -5,12 +5,11 @@
 
 {
     'name': 'POS Margin',
-    'version': '8.0.1.0.0',
+    'version': '8.0.1.0.1',
     'category': 'Point Of Sale',
-    'sequence': 1,
     'author': "GRAP,"
               "Odoo Community Association (OCA)",
-    'summary': 'Margin on PoS Order',
+    'summary': 'Margin on PoS Orders',
     'depends': [
         'point_of_sale',
     ],
@@ -18,4 +17,5 @@
         'views/view_pos_order.xml',
     ],
     'installable': True,
+    'pre_init_hook': 'pre_init_hook',
 }
diff --git a/pos_margin/hooks.py b/pos_margin/hooks.py
new file mode 100644
index 00000000..c406ad26
--- /dev/null
+++ b/pos_margin/hooks.py
@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2017 - Today: GRAP (http://www.grap.coop)
+# @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+import logging
+
+_logger = logging.getLogger(__name__)
+
+
+def _create_column(cr, table_name, column_name, column_type):
+    _logger.info("Fast creation of the column %s.%s" % (
+        table_name, column_name))
+
+    req = "ALTER TABLE %s ADD COLUMN %s %s" % (
+        table_name, column_name, column_type)
+    cr.execute(req)
+
+
+def pre_init_hook(cr):
+    _create_column(cr, 'pos_order_line', 'purchase_price', 'numeric')
+    _create_column(cr, 'pos_order_line', 'margin', 'numeric')
+    _create_column(cr, 'pos_order_line', 'margin_percent', 'numeric')
+    _create_column(cr, 'pos_order', 'margin', 'numeric')
+    _create_column(cr, 'pos_order', 'margin_percent', 'numeric')
diff --git a/pos_margin/i18n/fr.po b/pos_margin/i18n/fr.po
index 4d715b62..08ab4879 100644
--- a/pos_margin/i18n/fr.po
+++ b/pos_margin/i18n/fr.po
@@ -38,17 +38,19 @@ msgid "Lines of Point of Sale"
 msgstr "Lignes de Points de Vente"
 
 #. module: pos_margin
-#: field:pos.order,margin:0 field:pos.order.line,margin:0
+#: view:pos.order:pos_margin.view_pos_order_form
+#: field:pos.order,margin:0
+#: field:pos.order.line,margin:0
 msgid "Margin"
 msgstr "Marge"
 
+#. module: pos_margin
+#: field:pos.order,margin_percent:0
+#: field:pos.order.line,margin_percent:0
+msgid "Margin (%)"
+msgstr "Marge (%)"
+
 #. module: pos_margin
 #: model:ir.model,name:pos_margin.model_pos_order
 msgid "Point of Sale"
 msgstr "Point de Vente"
-
-#~ msgid "Margin (%)"
-#~ msgstr "Marge (%)"
-
-#~ msgid "Total"
-#~ msgstr "Total"
diff --git a/pos_margin/models/pos_order.py b/pos_margin/models/pos_order.py
index c117c163..a425913f 100644
--- a/pos_margin/models/pos_order.py
+++ b/pos_margin/models/pos_order.py
@@ -12,14 +12,24 @@ class PosOrder(models.Model):
 
     # Columns Section
     margin = fields.Float(
-        'Margin', compute='_compute_margin', store=True,
+        'Margin', compute='_compute_margin', store=True, multi='margin',
         digits_compute=dp.get_precision('Product Price'),
         help="It gives profitability by calculating the difference between"
         " the Unit Price and the cost price.")
 
+    margin_percent = fields.Float(
+        'Margin (%)', compute='_compute_margin', store=True, multi='margin',
+        digits_compute=dp.get_precision('Product Price'))
+
     # Compute Section
     @api.multi
-    @api.depends('lines.margin')
+    @api.depends('lines.margin', 'lines.price_subtotal')
     def _compute_margin(self):
         for order in self:
-            order.margin = sum(order.mapped('lines.margin'))
+            tmp_margin = sum(order.mapped('lines.margin'))
+            tmp_subtotal = sum(order.mapped('lines.price_subtotal'))
+            order.update({
+                'margin': tmp_margin,
+                'margin_percent': tmp_margin / tmp_subtotal * 100 if
+                tmp_subtotal else 0.0,
+            })
diff --git a/pos_margin/models/pos_order_line.py b/pos_margin/models/pos_order_line.py
index f50b7108..4b7f1f44 100644
--- a/pos_margin/models/pos_order_line.py
+++ b/pos_margin/models/pos_order_line.py
@@ -17,19 +17,44 @@ class PosOrderLine(models.Model):
         digits_compute=dp.get_precision('Product Price'))
 
     purchase_price = fields.Float(
-        'Cost Price', compute='_compute_multi_margin', store=True,
+        'Cost Price', digits_compute=dp.get_precision('Product Price'))
+
+    margin_percent = fields.Float(
+        'Margin (%)', compute='_compute_multi_margin', store=True,
         multi='multi_margin',
         digits_compute=dp.get_precision('Product Price'))
 
+    # Onchange Section
+    @api.multi
+    def onchange_product_id(
+            self, pricelist, product_id, qty=0, partner_id=False):
+        product_obj = self.env['product.product']
+        res = super(PosOrderLine, self).onchange_product_id(
+            pricelist, product_id, qty=qty, partner_id=partner_id)
+        if product_id:
+            product = product_obj.browse(product_id)
+            res['value']['purchase_price'] = product.standard_price
+        return res
+
     # Compute Section
     @api.multi
-    @api.depends('product_id', 'qty', 'price_subtotal')
+    @api.depends('purchase_price', 'qty', 'price_subtotal')
     def _compute_multi_margin(self):
         for line in self:
-            if not line.product_id:
-                line.purchase_price = 0
-                line.margin = 0
-            else:
-                line.purchase_price = line.product_id.standard_price
-                line.margin = line.price_subtotal - (
-                    line.product_id.standard_price * line.qty)
+            tmp_margin = line.price_subtotal - (line.purchase_price * line.qty)
+            line.update({
+                'margin': tmp_margin,
+                'margin_percent': (
+                    tmp_margin / line.price_subtotal * 100.0 if
+                        line.price_subtotal else 0.0),
+            })
+
+    # Overload Section. necessary, to manage pos order line creation from
+    # create_from_ui, because onchange section is not raised
+    @api.model
+    def create(self, vals):
+        if not vals.get('purchase_price', False):
+            product_obj = self.env['product.product']
+            product = product_obj.browse(vals.get('product_id'))
+            vals['purchase_price'] = product.standard_price
+        return super(PosOrderLine, self).create(vals)
diff --git a/pos_margin/static/description/pos_order_form.png b/pos_margin/static/description/pos_order_form.png
deleted file mode 100644
index 392b816a..00000000
Binary files a/pos_margin/static/description/pos_order_form.png and /dev/null differ
diff --git a/pos_margin/static/description/pos_order_form_view.png b/pos_margin/static/description/pos_order_form_view.png
new file mode 100644
index 00000000..059e538b
Binary files /dev/null and b/pos_margin/static/description/pos_order_form_view.png differ
diff --git a/pos_margin/static/description/pos_order_tree_view.png b/pos_margin/static/description/pos_order_tree_view.png
new file mode 100644
index 00000000..5c18a1e1
Binary files /dev/null and b/pos_margin/static/description/pos_order_tree_view.png differ
diff --git a/pos_margin/views/view_pos_order.xml b/pos_margin/views/view_pos_order.xml
index 50b594a0..383d0a48 100644
--- a/pos_margin/views/view_pos_order.xml
+++ b/pos_margin/views/view_pos_order.xml
@@ -12,12 +12,26 @@ License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
         <field name="inherit_id" ref="point_of_sale.view_pos_pos_form"/>
         <field name="arch" type="xml">
             <xpath expr="//group[@name='order_total']" position="after">
-                <group name="margin">
-                    <field name="margin" widget='monetary'/>
+                <group name="margin" string="Margin">
+                    <field name="margin" widget="monetary"/>
+                    <field name="margin_percent"/>
                 </group>
             </xpath>
-            <xpath expr="//field[@name='lines']/tree/field[@name='price_unit']" position="after">
+            <xpath expr="//field[@name='lines']/tree/field[@name='price_subtotal']" position="before">
                 <field name="purchase_price"/>
+                <field name="margin"/>
+                <field name="margin_percent"/>
+            </xpath>
+        </field>
+    </record>
+
+    <record id="view_pos_order_tree" model="ir.ui.view">
+        <field name="model">pos.order</field>
+        <field name="inherit_id" ref="point_of_sale.view_pos_order_tree"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='invoice_id']" position="after">
+                <field name="margin" widget="monetary" sum="Total"/>
+                <field name="margin_percent"/>
             </xpath>
         </field>
     </record>