partner-contact/partner_bank_mail_thread/views/res_partner_bank.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2017 ACSONE SA/NV
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->

<odoo>

    <record model="ir.ui.view" id="res_partner_bank_form_view">
        <field name="name">res.partner.bank.form (in partner_bank_active)</field>
        <field name="model">res.partner.bank</field>
        <field name="inherit_id" ref="base.view_partner_bank_form"/>
        <field name="arch" type="xml">

            <xpath expr="//form" position="inside">
                <div class="oe_chatter">
                    <field name="message_follower_ids" widget="mail_followers"/>
                    <field name="message_ids" widget="mail_thread"/>
                </div>
            </xpath>

        </field>
    </record>

</odoo>