flectra/addons/hr_holidays/report/hr_holidays_views.xml

<?xml version="1.0"?>
<flectra>
        <record id="view_holiday_pivot" model="ir.ui.view">
            <field name="name">hr.holidays.report_pivot</field>
            <field name="model">hr.holidays</field>
            <field name="priority">20</field>
            <field name="arch" type="xml">
                <pivot string="Leaves Summary">
                    <field name="employee_id" type="row"/>
                    <field name="type" type="row"/>
                    <field name="date_from" type="col"/>
                    <field name="number_of_days" type="measure"/>
                </pivot>
            </field>
        </record>

        <record id="view_holiday_graph" model="ir.ui.view">
            <field name="name">hr.holidays.report_graph</field>
            <field name="model">hr.holidays</field>
            <field name="priority">20</field>
            <field name="arch" type="xml">
                <graph string="Leaves Summary">
                    <field name="employee_id"/>
                    <field name="type"/>
                    <field name="number_of_days" type="measure"/>
                </graph>
            </field>
        </record>

        <record id="action_hr_available_holidays_report" model="ir.actions.act_window">
            <field name="name">Leaves Analysis</field>
            <field name="res_model">hr.holidays</field>
            <field name="view_type">form</field>
            <field name="view_mode">graph,pivot,calendar,form</field>
            <field name="view_id"></field>  <!-- force empty -->
            <field name="context">{'search_default_leaves':1}</field>
            <field name="search_view_id" ref="view_hr_holidays_filter"/>
        </record>

        <record id="action_window_leave_pivot" model="ir.actions.act_window.view">
            <field name="sequence" eval="2"/>
            <field name="view_mode">pivot</field>
            <field name="view_id" ref="view_holiday_pivot"/>
            <field name="act_window_id" ref="action_hr_available_holidays_report"/>
        </record>

        <record id="action_window_leave_graph" model="ir.actions.act_window.view">
            <field name="sequence" eval="1"/>
            <field name="view_mode">graph</field>
            <field name="view_id" ref="view_holiday_graph"/>
            <field name="act_window_id" ref="action_hr_available_holidays_report"/>
        </record>

        <menuitem
            name="Leaves"
            id="menu_hr_available_holidays_report_tree"
            action="action_hr_available_holidays_report"
            parent="menu_hr_holidays_report" sequence="5"/>

</flectra>