muk_web/muk_web_export/views/convert.xml

<?xml version="1.0" encoding="utf-8"?>

<!--     
	Copyright (C) 2017 MuK IT GmbH
	
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>. 
-->

<odoo>
	
	<record id="view_converter_export_form" model="ir.ui.view">
		<field name="name">muk_converter_convert.form</field>
		<field name="model">muk_converter.convert</field>
	    <field name="mode">primary</field>
	    <field name="inherit_id" ref="muk_converter.view_converter_convert_form"/>
	    <field name="arch" type="xml">
	    	<xpath expr="//field[@name='type']" position="attributes">
	        	<attribute name="readonly">1</attribute>
	        </xpath>
	        <xpath expr="//field[@name='input_url']" position="attributes">
	        	<attribute name="readonly">1</attribute>
	        </xpath>
	        <xpath expr="//field[@name='input_binary']" position="attributes">
	        	<attribute name="readonly">1</attribute>
	        </xpath>
	    </field>
	</record>

</odoo>