Odoo - Error while changing Sales Margin Settings

image

Sales - Setting - Margins

Error after applying Display Margins on quotations and sales orders. This is also seen on demo.mybahmni.org

Element '<xpath expr="//group[@name='sale_total']">' cannot be located in parent view

Error context:
View `sale.order.margin.view.form`
[view_id: 830, xml_id: n/a, model: sale.order, parent_id: 538]
None" while parsing /opt/bahmni-erp/odoo/addons/sale_margin/views/sale_margin_view.xml:4, near
<record model="ir.ui.view" id="sale_margin_sale_order">
        <field name="name">sale.order.margin.view.form</field>
        <field name="model">sale.order</field>
        <field name="inherit_id" ref="sale.view_order_form"/>
        <field name="arch" type="xml">
            <xpath expr="//group[@name='sale_total']" position="after">
                <group name="sale_margin_grp">
                    <field name="margin" groups="base.group_user"/>
                </group>
            </xpath>
        </field>
    </record>