xbus_message.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record id="xbus_message_view_tree" model="ir.ui.view">
        <field name="name">xbus_message_view_tree</field>
        <field name="model">xbus.message</field>
        <field name="arch" type="xml">
            <tree>
                <field name="envelope_id" />
                <field name="type" />
                <field name="uid" />
            </tree>
        </field>
    </record>

    <record id="xbus_message_view_form" model="ir.ui.view">
        <field name="name">xbus_message_view_form</field>
        <field name="model">xbus.message</field>
        <field name="arch" type="xml">
            <form string="Xbus Message">
                <sheet>
                    <group>
                        <field name="envelope_id" />
                        <field name="type" />
                        <field name="uid" />
                    </group>
                    <group>
                        <field name="header" />
                        <field name="body" />
                    </group>
                    <group>
                        <field
                            name="link_ids"
                            attrs="{'invisible': [('link_ids', '=', False)]}"
                        >
                            <tree>
                                <button
                                    name="action_open_document"
                                    string="Open Document"
                                    type="object"
                                    icon="fa-file-text-o"
                                    attrs="{'invisible': ['|', ('res_model', '=', False), ('res_id', '=', 0)]}"
                                />
                                <field name="res_model" />
                                <field name="res_id" />
                            </tree>
                        </field>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

    <record id="xbus_message_action" model="ir.actions.act_window">
        <field name="name">Xbus Messages</field>
        <field name="res_model">xbus.message</field>
        <field name="view_mode">tree,form</field>
    </record>

    <menuitem
        id="xbus_message_menuitem"
        name="Messages"
        parent="menu_xbus_common"
        action="xbus_message_action"
        sequence="2"
        groups="group_xbus_reader"
    />
</odoo>