oca-project/odoo-bringout-oca-project-project_task_material/project_task_material/views/project_view.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <!--
        Copyright 2012 - 2013 Daniel Reis
        Copyright 2015 - Antiun Ingeniería S.L. - Sergio Teruel
        Copyright 2016 - Tecnativa - Vicent Cubells
        Copyright 2018 - Brain-tec AG - Carlos Jesus Cebrian
        License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl-3.0).
    -->
    <record id="view_project_task_form_material" model="ir.ui.view">
        <field name="name">project.task.form.material</field>
        <field name="model">project.task</field>
        <field name="inherit_id" ref="project.view_task_form2" />
        <field name="arch" type="xml">
            <xpath expr="//notebook" position="inside">
                <page
                    name="material_used"
                    string="Material"
                    groups="project.group_project_user"
                >
                    <field name="material_ids">
                        <tree editable="top">
                            <field name="product_id" />
                            <field name="quantity" />
                        </tree>
                    </field>
                </page>
            </xpath>
        </field>
    </record>
</odoo>