stock-logistics-warehouse/stock_request_submit/views/stock_request_order_views.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <!--  Copyright 2019 Open Source Integrators
          Copyright 2019 Eficent Business and IT Consulting Services, S.L.
     License LGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
    <record model="ir.ui.view" id="stock_request_order_form">
        <field name="name">stock.request.order.form</field>
        <field name="model">stock.request.order</field>
        <field name="inherit_id" ref="stock_request.stock_request_order_form"/>
        <field name="arch" type="xml">
            <button name="action_confirm" position="after">
                <button name="action_submit"
                            string="Submit" type="object"
                            attrs="{'invisible': [('state', '!=', 'draft')]}"/>
            </button>
            <button name="action_confirm" position="attributes">
                <attribute name="attrs">{'invisible': [('state', '!=', 'submitted')]}</attribute>
            </button>
            <button name="action_draft" position="attributes">
                <attribute name="states">submitted,cancel</attribute>
            </button>
            <button name="action_cancel" position="attributes">
                <attribute name="states">draft,submitted,open</attribute>
            </button>
            <field name="stock_request_ids" position="attributes">
                <attribute name="attrs">{'readonly': [('state', 'not in', ['draft', 'submitted'])]}</attribute>
            </field>
            <field name="route_id" position="attributes">
                <attribute name="attrs">{'readonly': [('state', 'not in', ['draft', 'submitted'])]}</attribute>
            </field>
        </field>
    </record>

</odoo>