Add date_confirm in sale order view !

Add onchange on important sale.order fields

sale_usability_extension/sale_view.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-   Copyright (C) 2014 Akretion (http://www.akretion.com/)
+   Copyright (C) 2015 Akretion (http://www.akretion.com/)
    @author: Alexis de Lattre <alexis.delattre@akretion.com>
    The licence is in the file __openerp__.py
 -->
@@ -21,6 +21,10 @@
                 <field name="invoice_ids" nolabel="1" context="{'form_view_ref': 'account.invoice_form'}"/>
             </page>
         </notebook>
+        <field name="date_order" position="after">
+            <field name="date_confirm"
+                attrs="{'invisible': [('state', 'in', ('draft', 'sent'))]}"/>
+        </field>
     </field>
 </record>
 
@@ -43,8 +47,16 @@
         <field name="amount_total" position="after">
             <field name="currency_id" groups="base.group_multi_currency"/>
         </field>
+        <field name="date_order" position="attributes">
+            <attribute name="invisible">1</attribute>
+        </field>
+        <field name="date_order" position="after">
+            <field name="date_confirm"/>
+        </field>
     </field>
 </record>
 
+<!-- TODO : handle date_confirm in search/graph views -->
+
 </data>
 </openerp>