I have added the margin and margin percent columns in the treeview of the Quotations and Sales Ordes pages, and I have also added the "sum" attributes to both columns. <field name="arch" type="xml"> <xpath expr="//field[@name='partner_id']" position="after"> <field name="margin_percent" string="Margin Percent (%%)" groups="base.group_user" sum="Average Margins"/> <field name="margin" groups="base.group_user" sum="Total Margins"/> </xpath> </field> I would like to know if there is a way to change the "sum" attribute of the "Margin Percent" field to contain the average of the margins?

Any help is appreciated.