odoo/addons/purchase/report/purchase_report_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
        <record model="ir.ui.view" id="view_purchase_order_pivot">
            <field name="name">product.month.pivot</field>
            <field name="model">purchase.report</field>
            <field name="arch" type="xml">
                <pivot string="Purchase Orders Statistics" disable_linking="True">
                    <field name="partner_id" type="row"/>
                    <field name="date_order" interval="month" type="col"/>
                    <field name="price_total" type="measure"/>
                    <field name="unit_quantity" type="measure"/>
                    <field name="price_average" type="measure"/>
                </pivot>
            </field>
        </record>
        <record model="ir.ui.view" id="view_purchase_order_graph">
            <field name="name">product.month.graph</field>
            <field name="model">purchase.report</field>
            <field name="arch" type="xml">
                <graph string="Purchase Orders Statistics">
                    <field name="partner_id" type="row"/>
                    <field name="date_order" interval="month" type="col"/>
                    <field name="price_average" type="measure"/>
                </graph>
            </field>
        </record>

        <!-- Custom reports (aka filters) -->
        <record id="filter_purchase_order_monthly_purchases" model="ir.filters">
            <field name="name">Monthly Purchases</field>
            <field name="model_id">purchase.report</field>
            <field name="domain">[('state','&lt;&gt;','cancel')]</field>
            <field name="user_id" eval="False"/>
            <field name="context">{'group_by': ['category_id'], 'col_group_by': ['date_order:month'], 'measures': ['unit_quantity']}</field>
        </record>
        <record id="filter_purchase_order_price_per_supplier" model="ir.filters">
            <field name="name">Price Per Vendor</field>
            <field name="model_id">purchase.report</field>
            <field name="domain">[('state','&lt;&gt;','draft'),('state','&lt;&gt;','cancel')]</field>
            <field name="user_id" eval="False"/>
            <field name="context">{'group_by': ['partner_id'], 'col_group_by': ['product_id'], 'measures': ['price_average']}</field>
        </record>
        <record id="filter_purchase_order_average_delivery_time" model="ir.filters">
            <field name="name">Average Delivery Time</field>
            <field name="model_id">purchase.report</field>
            <field name="domain">[('state','&lt;&gt;','draft'),('state','&lt;&gt;','cancel')]</field>
            <field name="user_id" eval="False"/>
            <field name="context">{'group_by': ['partner_id'], 'measures': ['delay_pass']}</field>
        </record>


        <record id="view_purchase_order_search" model="ir.ui.view">
        <field name="name">report.purchase.order.search</field>
        <field name="model">purchase.report</field>
        <field name="arch" type="xml">
            <search string="Purchase Orders">
                <filter string="Quotations" name="quotes" domain="[('state','=','draft')]"/>
                <filter string="Orders" name="orders" domain="[('state','&lt;&gt;','draft'),('state','&lt;&gt;','cancel')]"/>
                <field name="partner_id"/>
                <field name="product_id"/>
                <group expand="0" string="Extended Filters">
                    <field name="user_id"/>
                    <field name="picking_type_id"/>
                    <field name="company_id" groups="base.group_multi_company"/>
                    <field name="date_order"/>
                    <field name="date_approve"/>
                    <field name="category_id" filter_domain="[('category_id', 'child_of', self)]"/>
                </group>
                <group expand="1" string="Group By">
                    <filter string="Vendor" name="group_partner_id" context="{'group_by':'partner_id'}"/>
                    <filter string="Partner's Country" name="country_id" context="{'group_by':'country_id'}"/>
                    <filter string="Responsible" name="Responsible" context="{'group_by':'user_id'}"/>
                    <filter string="Product Category" name="group_category_id" context="{'group_by':'category_id'}"/>
                    <filter string="Status" context="{'group_by':'state'}"/>
                    <filter string="Company" context="{'group_by':'company_id'}" groups="base.group_multi_company"/>
                    <separator/>
                    <filter string="Order Month" context="{'group_by':'date_order:month'}" help="Order of Day"/>
                    <filter string="Fiscal Position" context="{'group_by':'fiscal_position_id'}" help="Purchase Order Fiscal Position"/>
                </group>
            </search>
        </field>
    </record>

    <record id="action_purchase_order_report_all" model="ir.actions.act_window">
        <field name="name">Purchase Analysis</field>
        <field name="res_model">purchase.report</field>
        <field name="view_type">form</field>
        <field name="view_mode">pivot,graph</field>
        <field name="context">{'search_default_orders': 1}</field>
        <field name="view_id"></field>  <!-- force empty -->
        <field name="help">Purchase Analysis allows you to easily check and analyse your company purchase history and performance. From this menu you can track your negotiation performance, the delivery performance of your vendors, etc.</field>
    </record>

    <menuitem id="purchase_report" name="Reports" parent="menu_purchase_root" sequence="99"
        groups="purchase.group_purchase_manager" action="action_purchase_order_report_all"/>

</odoo>