Hi,

Please refer to the code below:

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

    <field name="name">sale.order.view.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']/list/field[@name='product_uom']" position="attributes">

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

        </xpath>

    </field>

</record>

Hope it helps.

< field  name = "uom_id"  readonly = "1" />
This will make the Unit of Measure field read-only in the form view, meaning users will not be able to modify it.
You can use the attribute to conditionally make the field read-only based on a certain condition (such as the state of the manufacturing order).
< field name = "uom_id"  attrs = "{'readonly': [('state', '=', 'done')]}" />
In this example, the UOM field will be read-only when the state of the Manufacturing Order is set to Done .