Hi,

Just you need to inherit of order line view and need to mention group_id and then you can make the field read-only/editable.

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

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

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

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

    <field name = "groups_id" eval = "[(6, 0, [ref ('module_name.group_id')])]" />

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

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

            <attribute name = "readonly"> 1 </attribute>

        </xpath>

    </field>

</record>

Regards