diff --git a/addons/mrp/mrp_view.xml b/addons/mrp/mrp_view.xml
index 3ce38e86db6..2bd8534ea16 100644
--- a/addons/mrp/mrp_view.xml
+++ b/addons/mrp/mrp_view.xml
@@ -971,7 +971,7 @@
                     <attribute name="invisible">False</attribute>
                 </xpath>
                 <group name="procurement_help" position="inside">
-                    <p attrs="{'invisible': [('type','=','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','produce')]}">
+                    <p attrs="{'invisible': ['|','|',('type','=','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','produce')]}">
                         When you sell this product, OpenERP will trigger <b>a manufacturing
                         order</b> using the bill of materials assigned to this product.
                         The delivery order will be ready once the production is done.
diff --git a/addons/procurement/procurement_view.xml b/addons/procurement/procurement_view.xml
index dcaa5e8d543..5660a148458 100644
--- a/addons/procurement/procurement_view.xml
+++ b/addons/procurement/procurement_view.xml
@@ -332,12 +332,12 @@
                 </xpath>
                 <xpath expr="//group[@name='general']" position="after" >
                    <group name="procurement_help" class="oe_grey" col="1" groups="base.group_user">
-                       <p attrs="{'invisible': [('type','&lt;&gt;','service'),('procure_method','&lt;&gt;','make_to_stock')]}">
+                       <p attrs="{'invisible': ['|','|',('type','&lt;&gt;','service'),('procure_method','&lt;&gt;','make_to_stock')]}">
                            When you sell this service, nothing special will be trigered
                            to deliver the customer, as you set the procurement method as
                            'Make to Stock'.
                        </p>
-                       <p attrs="{'invisible': [('type','&lt;&gt;','product'),('procure_method','&lt;&gt;','make_to_stock')]}">
+                       <p attrs="{'invisible': ['|','|',('type','&lt;&gt;','product'),('procure_method','&lt;&gt;','make_to_stock')]}">
                            When you sell this product, OpenERP will <b>use the available
                            inventory</b> for the delivery order.
                            <br/><br/>
@@ -345,7 +345,7 @@
                            will wait for new products. To fulfill the inventory, you should
                            create others rules like orderpoints.
                        </p>
-                       <p attrs="{'invisible': [('type','&lt;&gt;','consu'),('procure_method','&lt;&gt;','make_to_stock')]}">
+                       <p attrs="{'invisible': ['|','|',('type','&lt;&gt;','consu'),('procure_method','&lt;&gt;','make_to_stock')]}">
                            When you sell this product, a delivery order will be created.
                            OpenERP will consider that the <b>required quantities are always
                            available</b> as it's a consumable (as a result of this, the quantity
diff --git a/addons/project_mrp/project_mrp_view.xml b/addons/project_mrp/project_mrp_view.xml
index bf3536d5273..be6bae8ca61 100644
--- a/addons/project_mrp/project_mrp_view.xml
+++ b/addons/project_mrp/project_mrp_view.xml
@@ -40,7 +40,7 @@
                     <attribute name="invisible">False</attribute>
                 </xpath>
                 <group name="procurement_help" position="inside">
-                    <p attrs="{'invisible': [('type','&lt;&gt;','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','produce')]}">
+                    <p attrs="{'invisible': ['|','|',('type','&lt;&gt;','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','produce')]}">
                         When you sell this service to a customer, <b>a task</b> will be 
                         created to follow up the job to do. This task will appear
                         in the project related to the contract of the sale order.
diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 6d1ad931c71..4d273d90b32 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -608,13 +608,13 @@
             <field name="inherit_id" ref="procurement.product_form_view_procurement_button"/>
             <field name="arch" type="xml">
                 <group name="procurement_help" position="inside">
-                    <p attrs="{'invisible': [('type','&lt;&gt;','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','buy')]}">
+                    <p attrs="{'invisible': ['|','|',('type','&lt;&gt;','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','buy')]}">
                         When you sell this service to a customer, <b>a draft purchase order</b>
                         will be created in order to subcontract the job 
                         <i attrs="{'invisible': [('seller_id','=',False)]}">to 
                         <field name="seller_id" class="oe_inline"/></i>.
                     </p>
-                    <p attrs="{'invisible': [('type','=','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','buy')]}">
+                    <p attrs="{'invisible': ['|','|',('type','=','service'),('procure_method','&lt;&gt;','make_to_order'),('supply_method','&lt;&gt;','buy')]}">
                         When you sell this product, OpenERP will trigger <b>a draft
                         purchase order</b> to buy the required quantities to the supplier.
                         The delivery order will be ready after having received the