manufacture/quality_control_formula/views/qc_inspection_views.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  Copyright 2019 Simone Rubino - Agile Business Group
  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
  -->

<odoo>
    <record id="qc_inspection_form_view" model="ir.ui.view">
        <field name="name">Add formula</field>
        <field name="model">qc.inspection</field>
        <field name="inherit_id" ref="quality_control.qc_inspection_form_view"/>
        <field name="arch" type="xml">
            <xpath expr="//sheet/group/group[2]" position="inside">
                <button name="calculate_lines_values" string="Compute lines" type="object"/>
            </xpath>
            <xpath expr="//field[@name='inspection_lines']/tree/field[@name='name']" position="before">
                <field name="sequence" widget="handle"/>
                <field name="code"/>
                <field name="formula" invisble="True"/>
                <button name="calculate_value" string="Compute" type="object"
                        attrs="{'invisible': [('formula', '=', False)]}"/>
            </xpath>
            <xpath expr="//field[@name='inspection_lines']/tree/field[@name='qualitative_value']" position="before">
                <field name="input_value" attrs="{'readonly': [('formula', '=', False)]}"/>
            </xpath>
            <xpath expr="//field[@name='inspection_lines']/tree/field[@name='qualitative_value']" position="attributes">
                <attribute name="attrs">{'readonly': [
                    '|',
                    ('question_type', '=', 'quantitative'),
                    ('formula', '!=', False)
                    ]}</attribute>
            </xpath>
            <xpath expr="//field[@name='inspection_lines']/tree/field[@name='quantitative_value']" position="attributes">
                <attribute name="attrs">{'readonly': [
                    '|',
                    ('question_type', '=', 'qualitative'),
                    ('formula', '!=', False)
                    ]}</attribute>
            </xpath>
            <xpath expr="//field[@name='inspection_lines']/tree/field[@name='uom_id']" position="attributes">
                <attribute name="attrs">{'readonly': [
                    '|',
                    ('question_type', '=', 'qualitative'),
                    ('formula', '!=', False)
                    ]}</attribute>
            </xpath>
        </field>
    </record>
</odoo>