contract/agreement_legal/views/agreement_appendix.xml

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

<odoo>

    <!-- Agreement Appendix List View-->
    <record model="ir.ui.view" id="agreement_appendix_tree">
        <field name="name">Agreement Appendix Tree</field>
        <field name="model">agreement.appendix</field>
        <field name="arch" type="xml">
            <tree string="Appendices" default_order='agreement_id, sequence'>
                <field name="sequence" widget="handle"/>
                <field name="name"/>
                <field name="title"/>
                <field name="agreement_id"/>
                <field name="active" invisible="1"/>
            </tree>
        </field>
    </record>

    <!-- Agreement Appendix Form View -->
    <record model="ir.ui.view" id="agreement_appendix_form">
        <field name="name">Agreement Appendix Form</field>
        <field name="model">agreement.appendix</field>
        <field name="arch" type="xml">
            <form string="Appendix">
                <sheet>
                    <div class="oe_button_box" name="button_box">
                        <button name="toggle_active" type="object" class="oe_stat_button" icon="fa-archive">
                            <field name="active" widget="boolean_button" options="{&quot;terminology&quot;: &quot;archive&quot;}"/>
                        </button>
                    </div>
                    <div class="oe_title">
                        <label for="name" class="oe_edit_only"/>
                        <h1><field name="name"/></h1>
                    </div>
                    <group>
                        <group>
                            <field name="title"/>
                            <field name="agreement_id"/>
                        </group>
                        <group>
                            <field name="sequence"/>
                        </group>
                    </group>
                    <field name="content" widget="html"/>
                    <group class="oe_edit_only">
                        <group>
                            <field name="field_id"
                                   domain="[('model_id', '=', active_model),
                                            ('ttype', '!=', 'one2many'),
                                            ('ttype', '!=', 'many2many')]"/>
                            <field name="sub_object_id" readonly="1"/>
                            <field name="sub_model_object_field_id"
                                   domain="[('model_id', '=', sub_object_id),
                                            ('ttype', '!=', 'one2many'),
                                            ('ttype', '!=', 'many2many')]"
                                   attrs="{'readonly':[('sub_object_id', '=', False)],
                                           'required':[('sub_object_id', '!=', False)]}"/>
                            <field name="default_value"/>
                            <field name="copyvalue"/>
                        </group>
                        <p>
                            This section (on the left) allows you to add dynamic fields inside the content.
                            <ol>
                                <li>Select the appendix field</li>
                                <li>Select the sub-field</li>
                                <li>Enter the default value if the field is empty</li>
                                <li>Copy and paste the placeholder expression in the content</li>
                            </ol>
                        </p>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

    <!-- Agreement Appendix Search View -->
    <record model="ir.ui.view" id="agreement_appendix_search">
        <field name="name">Agreement Appendix Search</field>
        <field name="model">agreement.appendix</field>
        <field name="arch" type="xml">
            <search>
                <filter name="group_agreement" icon="terp-partner" context="{'group_by':'agreement_id'}"/>
            </search>
        </field>
    </record>

    <!-- Actions opening views on models -->
    <record model="ir.actions.act_window" id="agreement_appendix_action">
        <field name="name">Appendices</field>
        <field name="res_model">agreement.appendix</field>
        <field name="view_mode">tree,form</field>
    </record>

</odoo>