oca-technical/odoo-bringout-oca-maintenance-maintenance_plan_activity/maintenance_plan_activity/views/maintenance_views.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <!-- maintenance.plan : views -->
    <record id="maintenance_plan_view_form" model="ir.ui.view">
        <field name="name">maintenance.plan.form</field>
        <field name="model">maintenance.plan</field>
        <field name="inherit_id" ref="maintenance_plan.maintenance_plan_view_form" />
        <field name="arch" type="xml">
            <xpath expr="//form/sheet/notebook/page[1]" position="after">
                <page string="Scheduled Activities">
                    <field name="planned_activity_ids" nolabel="1" />
                </page>
            </xpath>
        </field>
    </record>
    <!--    maintenance.planned.activities : views-->
    <record id="maintenance_planned_activity_view_tree" model="ir.ui.view">
        <field name="name">maintenance.planned.activity.tree</field>
        <field name="model">maintenance.planned.activity</field>
        <field name="arch" type="xml">
            <tree editable="bottom">
                <field name="activity_type_id" />
                <field name="user_id" />
                <field name="date_before_request" />
            </tree>
        </field>
    </record>
</odoo>