diff --git a/addons/stock_invoice_directly/wizard/stock_invoice.py b/addons/stock_invoice_directly/wizard/stock_invoice.py
index 2eaf0adb4a6..84a24ebb6fe 100644
--- a/addons/stock_invoice_directly/wizard/stock_invoice.py
+++ b/addons/stock_invoice_directly/wizard/stock_invoice.py
@@ -20,17 +20,24 @@
 ##############################################################################
 
 from osv import fields, osv
-from tools.translate import _
 
 class invoice_directly(osv.osv_memory):
     _inherit = 'stock.partial.picking'
 
     def do_partial(self, cr, uid, ids, context):
+        """ Makes partial moves and pickings done and 
+            launches Create invoice wizard if invoice state is To be Invoiced.
+        @param self: The object pointer.
+        @param cr: A database cursor
+        @param uid: ID of the user currently logged in
+        @param context: A standard dictionary
+        @return:
+        """
         result = super(invoice_directly, self).do_partial(cr, uid, ids, context)
         pick_obj = self.pool.get('stock.picking')
         picking_ids = context.get('active_ids', False)
         pick = pick_obj.browse(cr, uid, picking_ids, context)[0]
-        if pick.invoice_state=='2binvoiced':
+        if pick.invoice_state == '2binvoiced':
             return {
                 'name': 'Create Invoice',
                 'view_type': 'form',
@@ -38,7 +45,7 @@ class invoice_directly(osv.osv_memory):
                 'res_model': 'stock.invoice.onshipping',
                 'type': 'ir.actions.act_window',
                 'target': 'new',
-                }
+            }
         return {}
 
 invoice_directly()