diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 807ab9ceb64..2583d0a63ee 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -189,8 +189,8 @@
                                 <!-- default form view -->
                             </field>
                             <group col="7" colspan="4">
-                                <field name="amount_untaxed" sum="Untaxed amount" groups="base.group_purchase_taxes_on_order_line,base.group_purchase_taxes_global_on_order"/>
-                                <field name="amount_tax" groups="base.group_purchase_taxes_on_order_line,base.group_purchase_taxes_global_on_order"/>
+                                <field name="amount_untaxed" sum="Untaxed amount" groups="purchase.group_taxes_on_order_line,purchase.group_taxes_global_on_order"/>
+                                <field name="amount_tax" groups="purchase.group_taxes_on_order_line,purchase.group_taxes_global_on_order"/>
                                 <field name="amount_total" sum="Total amount"/>
                                 <button name="button_dummy" states="draft" string="Compute" type="object" icon="gtk-execute"/>
                             </group>
@@ -367,7 +367,7 @@
                             <field name="price_unit"/>
                             <field name="company_id" groups="base.group_multi_company" widget="selection"/>
                             <field name="account_analytic_id" colspan="4" groups="analytic.group_analytic_accounting" domain="[('parent_id','!=',False)]" />
-                            <group colspan="4" col="4" groups="base.group_purchase_taxes_on_order_line">
+                            <group colspan="4" col="4" groups="purchase.group_taxes_on_order_line">
                                 <separator colspan="4" string="Taxes"/>
                                 <field colspan="4" nolabel="1" name="taxes_id"
                                     domain="[('parent_id','=',False),('type_tax_use','!=','sale')]"/>
diff --git a/addons/purchase/res_config.py b/addons/purchase/res_config.py
index 623c1461769..ce67e168fd4 100644
--- a/addons/purchase/res_config.py
+++ b/addons/purchase/res_config.py
@@ -60,9 +60,9 @@ class purchase_config_settings(osv.osv_memory):
             'Taxes', required=True,
             help="""Choose between either applying global taxes on a purchase order, or applying different taxes on purchase order lines, or applying no tax at all."""),
         'group_purchase_taxes_global_on_order':fields.boolean("Global on order",
-            implied_group='base.group_purchase_taxes_global_on_order'),
+            implied_group='purchase.group_taxes_global_on_order'),
         'group_purchase_taxes_on_order_line':fields.boolean("On order line",
-            implied_group='base.group_purchase_taxes_on_order_line'),
+            implied_group='purchase.group_taxes_on_order_line'),
     }
 
     def default_get(self, cr, uid, fields, context=None):
diff --git a/addons/purchase/security/purchase_security.xml b/addons/purchase/security/purchase_security.xml
index 11dfe28b0b0..ba5e7fe5256 100644
--- a/addons/purchase/security/purchase_security.xml
+++ b/addons/purchase/security/purchase_security.xml
@@ -6,28 +6,23 @@
         <field name="name">User</field>
         <field name="category_id" ref="base.module_category_purchase_management"/>
     </record>
+
     <record id="group_purchase_manager" model="res.groups">
         <field name="name">Manager</field>
         <field name="category_id" ref="base.module_category_purchase_management"/>
         <field name="implied_ids" eval="[(4, ref('group_purchase_user'))]"/>
     </record>
 
-    <record id="base.group_purchase_taxes_global_on_order" model="res.groups">
+    <record id="group_taxes_global_on_order" model="res.groups">
         <field name="name">Purchase Taxes Global on Order</field>
         <field name="category_id" ref="base.module_category_hidden"/>
     </record>
 
-    <record id="base.group_purchase_taxes_on_order_line" model="res.groups">
+    <record id="group_taxes_on_order_line" model="res.groups">
         <field name="name">Purchase Taxes on Order Lines</field>
         <field name="category_id" ref="base.module_category_hidden"/>
     </record>
 
-    <record id="base.group_user" model="res.groups">
-        <field name="implied_ids" eval="[(6,0,[
-        ref('base.group_purchase_taxes_global_on_order'),
-        ])]"/>
-    </record>
-
     <record model="ir.rule" id="purchase_order_comp_rule">
         <field name="name">Purchase Order multi-company</field>
         <field name="model_id" ref="model_purchase_order"/>