Force tree view for product on sale line

sale.xml

@@ -673,7 +673,18 @@
                     <label name="sequence"/>
                     <field name="sequence"/>
                     <label name="product"/>
-                    <field name="product"/>
+                    <field name="product">
+                        <tree string="Products">
+                            <field name="name" select="1"/>
+                            <field name="code" select="1"/>
+                            <field name="list_price_uom" select="2"/>
+                            <field name="cost_price_uom" select="2"/>
+                            <field name="quantity" select="2"/>
+                            <field name="forecast_quantity" select="2"/>
+                            <field name="default_uom" select="2"/>
+                            <field name="active" select="2"/>
+                        </tree>
+                    </field>
                     <newline/>
                     <label name="description"/>
                     <field name="description" colspan="3"/>