diff --git a/addons/purchase/res_config.py b/addons/purchase/res_config.py
index 4d98ea40012..c5e72db9f1a 100644
--- a/addons/purchase/res_config.py
+++ b/addons/purchase/res_config.py
@@ -48,16 +48,16 @@ class purchase_config_settings(osv.osv_memory):
                 lines on a purchase order between several accounts and analytic plans.
                 This installs the module purchase_analytic_plans."""),
         'module_warning': fields.boolean("Alerts by Products or Supplier",
-            help="""Allow to configure warnings on products and trigger them when a user wants to purchase a given product or a given supplier. 
+            help="""Allow to configure warnings on products and trigger them when a user wants to purchase a given product or a given supplier.
             Example: Product: this product is deprecated, do not purchase more than 5.
                     Supplier: don't forget to ask for an express delivery."""),
-        
+
         'module_purchase_double_validation': fields.boolean("Two Levels of Approval",
             help="""Provide a double validation mechanism for purchases exceeding minimum amount.
                 This installs the module purchase_double_validation."""),
         'module_purchase_requisition': fields.boolean("Manage Purchase Requisitions",
-            help="""Purchase Requisitions are used when you want to request quotations from several suppliers for a given set of products. 
-            You can configure per product if you directly do a Request for Quotation 
+            help="""Purchase Requisitions are used when you want to request quotations from several suppliers for a given set of products.
+            You can configure per product if you directly do a Request for Quotation
             to one supplier or if you want a purchase requisition to negotiate with several suppliers."""),
         'decimal_precision': fields.integer('Decimal Precision on Price',help="As an example, a decimal precision of 2 will allow prices   like: 9.99 EUR, whereas a decimal precision of 4 will allow prices  like:  0.0231 EUR per unit."),
     }
@@ -81,16 +81,14 @@ class account_config_settings(osv.osv_memory):
     _inherit = 'account.config.settings'
     _columns = {
         'module_purchase_analytic_plans': fields.boolean('Several Analytic Accounts on Purchases',
-            help="""This allows install module purchase_analytic_plans."""),                 
+            help="""This allows install module purchase_analytic_plans."""),
         'group_analytic_account_for_purchases': fields.boolean('Analytic Accounting for Purchases',
             implied_group='purchase.group_analytic_accounting',
             help="Allows you to specify an analytic account on purchase orders."),
     }
-    
+
     def onchange_purchase_analytic_plans(self, cr, uid, ids, module_purchase_analytic_plans, context=None):
-        if not module_purchase_analytic_plans:
-            return {'value':{'group_analytic_account_for_purchases': False} }
-        return {'value': {'group_analytic_account_for_purchases': True}}
-        
+        """ change group_analytic_account_for_purchases following module_purchase_analytic_plans """
+        return {'value': {'group_analytic_account_for_purchases': module_purchase_analytic_plans}}
 
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
diff --git a/addons/purchase/res_config_view.xml b/addons/purchase/res_config_view.xml
index c1342064aca..301460d5937 100644
--- a/addons/purchase/res_config_view.xml
+++ b/addons/purchase/res_config_view.xml
@@ -62,7 +62,5 @@
             </field>
         </record>
 
-
-
     </data>
 </openerp>