[ADD]Add mandate in tree view

views/res_partner.xml

@@ -234,6 +234,7 @@
                     <field name="zip" optional="show" />
                 </xpath>
                 <xpath expr="//field[@name='category_id']" position="after">
+                    <field name="mandate_id" optional="show" />
                     <field
                         name="project_category_ids"
                         optional="show"