trytonpsk-crm/view/validation_history_form.xml

<?xml version="1.0"?>
<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
this repository contains the full copyright notices and license terms. -->
<form>
    <label name="line_ask"/>
    <field name="line_ask"/>
    <!-- <label name="validated_by"/>
    <field name="validated_by"/> -->
</form>