[IMP] stock: add scheduled date on picking.

When a picking is in 'Done' state, we add the effective date on the form in
addition to the effective date. The user can know the date when the picking was effectively
made.

addons/stock/models/stock_picking.py

@@ -229,7 +229,7 @@ class Picking(models.Model):
         default=fields.Datetime.now, index=True, track_visibility='onchange',
         states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
         help="Creation Date, usually the time of the order")
-    date_done = fields.Datetime('Date of Transfer', copy=False, readonly=True, help="Completion Date of Transfer")
+    date_done = fields.Datetime('Date of Transfer', copy=False, readonly=True, help="Date at which the transfer has been processed or cancelled.")
 
     location_id = fields.Many2one(
         'stock.location', "Source Location",

addons/stock/views/stock_picking_views.xml

@@ -247,6 +247,7 @@
                         </group>
                         <group>
                             <field name="scheduled_date" attrs="{'readonly': [('id', '=', False)], 'required': [('id', '!=', False)]}"/>
+                            <field name="date_done" string="Effective Date" attrs="{'invisible': [('state', '!=', 'done')]}"/>
                             <field name="origin" placeholder="e.g. PO0032"/>
                             <field name="owner_id" groups="stock.group_tracking_owner"/>
                             <div groups="stock.group_tracking_owner" colspan="2" col="2">