odoo_source/addons/crm/views/res_partner_views.xml

<?xml version="1.0"?>
<odoo>

        <!-- open meetings related to given partner -->
        <record id="calendar_event_partner" model="ir.actions.act_window">
            <field name="name">Meetings</field>
            <field name="src_model">res.partner</field>
            <field name="res_model">calendar.event</field>
            <field name="view_mode">calendar,tree,form</field>
            <field name="context">{'default_partner_ids': [active_id], 'search_default_partner_ids': [active_id]}</field>
        </record>

        <!-- open opportunities related to given partner -->
        <record id="relate_partner_opportunities" model="ir.actions.act_window">
            <field name="name">Opportunities</field>
            <field name="res_model">crm.lead</field>
            <field name="view_mode">kanban,tree,form,graph,calendar</field>
            <field name="domain">[('type','=','opportunity')]</field>
            <field name="context">{
                'search_default_partner_id': active_id,
                'default_type': 'opportunity'
            }</field>
            <field name="view_id" eval="False"/>
            <field name="search_view_id" ref="crm.view_crm_case_opportunities_filter"/>
            <field name="help" type="html">
              <p class="o_view_nocontent_smiling_face">
                Create an new opportunity related to this customer
              </p><p>
                Use opportunities to keep track of your sales pipeline, follow
                up potential sales and better forecast your future revenues.
              </p><p>
                You will be able to plan meetings and log activities from
                opportunities, convert them into quotations, attach related
                documents, track all discussions, and much more.
              </p>
            </field>
        </record>

        <record id="relate_partner_opportunities_kanban" model="ir.actions.act_window.view">
            <field name="sequence" eval="0"/>
            <field name="view_mode">kanban</field>
            <field name="view_id" ref="crm_case_kanban_view_leads"/>
            <field name="act_window_id" ref="relate_partner_opportunities"/>
        </record>

        <record id="relate_partner_opportunities_tree" model="ir.actions.act_window.view">
            <field name="sequence" eval="1"/>
            <field name="view_mode">tree</field>
            <field name="view_id" ref="crm_case_tree_view_oppor"/>
            <field name="act_window_id" ref="relate_partner_opportunities"/>
        </record>

        <record id="relate_partner_opportunities_form" model="ir.actions.act_window.view">
            <field name="sequence" eval="2"/>
            <field name="view_mode">form</field>
            <field name="view_id" ref="crm_case_form_view_oppor"/>
            <field name="act_window_id" ref="relate_partner_opportunities"/>
        </record>

        <!-- Partner kanban view inherte -->
        <record id="crm_lead_partner_kanban_view" model="ir.ui.view">
            <field name="name">res.partner.kanban.inherit</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.res_partner_kanban_view"/>
            <field name="priority" eval="10"/>
            <field name="groups_id" eval="[(4, ref('sales_team.group_sale_salesman'))]"/>
            <field name="arch" type="xml">
                <field name="mobile" position="after">
                    <field name="opportunity_count"/>
                    <field name="meeting_count"/>
                </field>
                <xpath expr="//div[hasclass('oe_kanban_partner_links')]" position="inside">
                    <span class="badge" t-if="record.opportunity_count.value>0"><i class="fa fa-fw fa-star"/><t t-esc="record.opportunity_count.value"/></span>
                    <span class="badge" t-if="record.meeting_count.value>0"><i class="fa fa-fw fa-calendar"/><t t-esc="record.meeting_count.value"/></span>
                </xpath>
            </field>
        </record>
        <!-- tree view of crm.activity.report -->
        <record id="crm_activity_report_view_tree" model="ir.ui.view">
            <field name="name">crm.activity.report.tree</field>
            <field name="model">crm.activity.report</field>
            <field name="arch" type="xml">
                <tree delete="false" create="false">
                    <field name="author_id"/>
                    <field name="subtype_id"/>
                    <field name="subject"/>
                    <field name="date"/>
                </tree>
            </field>
        </record>

        <!-- Add contextual button on partner form view -->
        <record id="view_partners_form_crm1" model="ir.ui.view">
            <field name="name">view.res.partner.form.crm.inherited1</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field eval="18" name="priority"/>
            <field name="groups_id" eval="[(4, ref('sales_team.group_sale_salesman'))]"/>
            <field name="arch" type="xml">
                <data>
                    <button name="toggle_active" position="before">
                        <button class="oe_stat_button o_res_partner_tip_opp" type="action"
                            attrs="{'invisible': [('customer', '=', False)]}"
                            name="%(crm.crm_lead_opportunities)d"
                            icon="fa-star"
                            context="{'search_default_partner_id': active_id}">
                            <field string="Opportunities" name="opportunity_count" widget="statinfo"/>
                        </button>
                        <button class="oe_stat_button" type="object"
                            name="schedule_meeting"
                            icon="fa-calendar"
                            context="{'partner_id': active_id, 'partner_name': name}">
                            <field string="Meetings" name="meeting_count" widget="statinfo"/>
                        </button>
                    </button>
                </data>
            </field>
        </record>

</odoo>