diff --git a/addons/purchase/board_purchase_view.xml b/addons/purchase/board_purchase_view.xml
index 475873a138e..c4f8d447a21 100644
--- a/addons/purchase/board_purchase_view.xml
+++ b/addons/purchase/board_purchase_view.xml
@@ -33,8 +33,8 @@
             <field name="arch" type="xml">
                 <tree string="Monthly Purchase by Category">
                     <field name="month"/>
-                    <field name="price_total"/>
                     <field name="category_id"/>
+                    <field name="price_total"/>
                 </tree>
             </field>
         </record>
@@ -55,6 +55,7 @@
 	        <field name="res_model">purchase.report</field>
 	        <field name="view_type">form</field>
 	        <field name="view_mode">graph,tree</field>
+		<field name="context">{'group_by':['month','category_id'],'group_by_no_leaf':1}</field>
 	        <field name="view_id" ref="view_purchase_order_monthly_categ_graph"></field>
 	    </record>
 	    <record id="open_view_purchase_order_monthly_categ_tree" model="ir.actions.act_window.view">
@@ -97,6 +98,7 @@
 	        <field name="res_model">purchase.report</field>
 	        <field name="view_type">form</field>
 	        <field name="view_mode">graph,tree</field>
+		<field name="context">{'group_by':['partner_id'],'group_by_no_leaf':1}</field>
 	        <field name="view_id" ref="view_negotiation_by_supplier_graph"/>
 	    </record>
 	    <record id="open_view_negotiation_by_supplier_tree" model="ir.actions.act_window.view">
diff --git a/addons/purchase/report/purchase_report_view.xml b/addons/purchase/report/purchase_report_view.xml
index f5d1f7a3b42..5dfdd3255ad 100644
--- a/addons/purchase/report/purchase_report_view.xml
+++ b/addons/purchase/report/purchase_report_view.xml
@@ -25,6 +25,7 @@
                     <field name="user_id" invisible="1"/>
                     <field name="partner_id" invisible="1"/>
                     <field name="product_id" invisible="1"/>
+                    <field name="category_id" invisible="1"/>
                     <field name="product_uom" invisible="1"/>
                     <field name="day" invisible="1"/>
                     <field name="name" invisible="1"/>
@@ -99,6 +100,7 @@
                     <filter string="Validated by" icon="terp-personal" context="{'group_by':'validator'}"/>
  					<separator orientation="vertical"/>
                     <filter string="Product" name="group_product_id" icon="terp-accessories-archiver" context="{'group_by':'product_id'}"/>
+                    <filter string="Category" name="group_category_id" icon="terp-accessories-archiver" context="{'group_by':'category_id'}"/>
                     <filter string="Product UOM" name="group_product_uom" icon="terp-accessories-archiver" context="{'group_by':'product_uom'}"/>
                     <filter string="Warehouse" icon="terp-go-home" context="{'group_by':'warehouse_id'}" groups="base.group_extended"/>
                     <filter string="Destination" icon="terp-gtk-jump-to-ltr" context="{'group_by':'location_id'}"/>