Hi Rudy,

By defining owner groups for the field margin and margin total will solve your issue.

Try this in your xml file:

<record id="view_sale_order_form_inherit" model="ir.ui.view">

        <field name="name">sale.order.form.inherit</field>

        <field name="model">sale.order</field>

        <field name="inherit_id" ref="sale.view_order_form"/>

        <field name="arch" type="xml">

            <xpath expr="//field[@name='order_line']//tree/field[@name='margin']" position="attributes">

                <attribute name="groups">your_owner_group</attribute>

            </xpath>

</field>

</record>

If you don't have seperate groups for owner and admin, try by creating a new group for owner

For more info: https://www.youtube.com/watch?v=3JsCu8_Dj3I

Thank you