yaltik_odoo_custom/note_task/note_task_view.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
Copyright 2016 Fabien Bourgeois <fabien@yaltik.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->

<openerp>
  <data>
    <!-- Form -->
    <record id="note_task_form" model="ir.ui.view">
      <field name="name">Note Task</field>
      <field name="model">note.note</field>
      <field name="inherit_id" ref="note_base.form" />
      <field name="arch" type="xml">
        <field name="tag_ids" position="before">
          <field name="task_id" string="Linked task" />
        </field>
      </field>
    </record>
    <!-- Kanban extension -->
    <record id="view_kanban_note_task" model="ir.ui.view">
      <field name="name">Note Task</field>
      <field name="model">note.note</field>
      <field name="inherit_id" ref="note.view_note_note_kanban" />
      <field name="arch" type="xml">
        <field name="tag_ids" position="after">
          <field name="task_id" />
        </field>
        <xpath
          expr="//div[contains(@t-attf-class, 'oe_kanban_content')]"
          position="inside">
          <p t-if="record.task_id.raw_value" style="color: grey">
            Linked Task : <field name="task_id"/>
          </p>
        </xpath>
      </field>
    </record>
  </data>
</openerp>