diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index c564b6eaf6e..94a43cad0d9 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -179,7 +179,7 @@
             <field name="model">purchase.order</field>
             <field name="type">tree</field>
             <field name="arch" type="xml">
-                <tree string="Purchase Order">
+                <tree colors="grey:state in ('approved','done');blue:state in ('wait','confirmed');red:state in ('except_invoice','except_picking')" string="Purchase Order">
                     <field name="name" string="Reference"/>
                     <field name="date_order" string="Order Date"/>
                     <field name="partner_id"/>