suite/delivery_gls_nl/views/delivery_gls_nl_view.xml

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

    <record id="view_delivery_carrier_form_with_provider_gls_nl" model="ir.ui.view">
        <field name="name">delivery.carrier.form.provider.gls_nl</field>
        <field name="model">delivery.carrier</field>
        <field name="inherit_id" ref="delivery.view_delivery_carrier_form"/>
        <field name="arch" type="xml">
            <xpath expr="//page[@name='destination']" position='before'>
                <page string="GLS NL Configuration" attrs="{'invisible': [('delivery_type', '!=', 'gls_nl')]}">
                    <group>
                        <group>
                            <field name="gls_nl_username" attrs="{'required': [('delivery_type', '=', 'gls_nl')]}" />
                            <field name="gls_nl_password" attrs="{'required': [('delivery_type', '=', 'gls_nl')]}" password="True"/>
                        </group>
                        <group>
                            <button name="button_gls_nl_test_rates" type="object" string="Test Rates" class="bnt-primary" attrs="{'invisible': [('gls_nl_rate_id', '=', False)]}"/>
                            <field name="gls_nl_rate_id"/>
                            <field name="gls_nl_labeltype" attrs="{'required': [('delivery_type', '==', 'gls_nl')]}"/>
                            <field name="gls_nl_express"/>
                        </group>
                    </group>
                    <group string='GLS NL Tutorial'>
                        <ul>
                            <li>
                                <b>Go to <a href='https://api-portal.gls.nl/' target='_blank'>GLS Netherlands API</a> to create an API capable account.</b>
                                <br/><br/>
                            </li>
                            <li>
                                <p>You can use the username of "test" and any password to use default test credentials (only when not in Production mode).
                                    This allows you to put in your production password and simply replace the username with "test" to use the API default test credentials.<br/>
                                    (as of 2019-07-28 it is known that actual credentials will not work on the test environment, and the test environment is not available at all times of the day)</p>
                            </li>
                            <li>
                                <b>Rates can be uploaded with the following format.</b>
                                <ul>
                                    <li>Header row with One Column named "Country". Rows should have 2 letter country codes in this column.</li>
                                    <li>Header row with numeric values in ascending value to the right (weight in kg).  Rows should have the rate in Euros if the order/package is less than the header weight.</li>
                                    <li>Columns not matching the mentioned headers will be ignored and can be used for comments or maintainer data.</li>
                                </ul>
                                <p>Example:</p>
                                <pre>Country Name,Country,2,5,15,32
Belgium,BE,4.7,4.95,5.9,9.7
Germany,DE,4.15,5.3,6.4,12.8
                                </pre>
                                <p>Rating a package going to Germany weighing <b>4.5kg</b> (less than 5kg) will return <b>5.30 EUR</b> (converted to order currency).</p>
                                <p>It is recommended to name the attachment appropriately (e.g. <b>GLS_RATES_2019.csv</b>), and find/use the same attachment on other delivery methods (e.g. with express settings and higher margin).</p>
                                <br/><br/>
                            </li>
                            <li>
                                Use the <b>Test Rates</b> button to perform a thorough test (weights parse as numeric for all rows, country is round in Odoo database).
                                <br/><br/>
                            </li>
                        </ul>
                    </group>
                </page>
            </xpath>
        </field>
    </record>

</odoo>