contract/contract_forecast/views/contract_line_forecast_period.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2019 ACSONE SA/NV
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->

<odoo>


    <record model="ir.ui.view" id="contract_line_forecast_period_search_view">
        <field name="name">contract.line.forecast.period.search (in
            contract_forecast)
        </field>
        <field name="model">contract.line.forecast.period</field>
        <field name="arch" type="xml">
            <search>
                <field name="contract_id" string="Contract"/>
                <group expand="0" string="Group By">
                    <filter string="Date Start" name="groupby_date_start"
                            context="{'group_by':'date_start'}"/>
                    <filter string="Date End" name="groupby_date_end"
                            context="{'group_by':'date_end'}"/>
                    <filter string="Date Invoice" name="groupby_date_invoice"
                            context="{'group_by':'date_invoice'}"/>
                </group>
            </search>
        </field>
    </record>

    <record model="ir.ui.view" id="contract_line_forecast_period_tree_view">
        <field name="name">contract.line.forecast.period.tree (in
            contract_forecast)
        </field>
        <field name="model">contract.line.forecast.period</field>
        <field name="arch" type="xml">
            <tree editable="top" create="false" edit="false" delete="false">
                <field name="name"/>
                <field name="contract_id"/>
                <field name="date_start"/>
                <field name="date_end"/>
                <field name="date_invoice"/>
            </tree>
        </field>
    </record>

    <record id="contract_line_forecast_period_pivot_view" model="ir.ui.view">
        <field name="name">contract.line.forecast.period.tree (in
            contract_forecast)
        </field>
        <field name="model">contract.line.forecast.period</field>
        <field name="arch" type="xml">
            <pivot string="Contract Forecast">
                <field name="product_id" type="row"/>
                <field name="date_invoice" type="col"/>
                <field name="price_subtotal" type="measure"/>
            </pivot>
        </field>
    </record>

</odoo>