enterprise-addons/project_enterprise/views/project_sharing_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="project_sharing_project_task_view_form_inherited" model="ir.ui.view">
        <field name="name">project.task.form.timesheet.inherited</field>
        <field name="model">project.task</field>
        <field name="priority">400</field>
        <field name="inherit_id" ref="project.project_sharing_project_task_view_form"/>
        <field name="arch" type="xml">
            <xpath expr="//group/field[@name='date_deadline']" position="attributes">
                <attribute name="nolabel">1</attribute>
                <attribute name="widget">daterange</attribute>
                <attribute name="options">{'start_date_field': 'planned_date_begin'}</attribute>
            </xpath>
            <xpath expr="//group/field[@name='date_deadline']" position="after">
                <field name="planned_date_begin" invisible="1"/>
            </xpath>
            <xpath expr="//group/field[@name='date_deadline']" position="before">
                <label for="date_deadline" invisible="planned_date_begin"
                    decoration-danger="date_deadline &lt; current_date and state not in ['1_done', '1_canceled']"/>
            </xpath>
            <xpath expr="//group/label[@for='date_deadline']" position="after">
                <label for="date_deadline" string="Planned Date" invisible="not planned_date_begin"
                    decoration-danger="date_deadline &lt; current_date and state not in ['1_done', '1_canceled']"/>
            </xpath>
            <xpath expr="//field[@name='child_ids']/list//field[@name='date_deadline']" position="attributes">
                <attribute name="widget">daterange</attribute>
                <attribute name="options">{'start_date_field': 'planned_date_begin'}</attribute>
            </xpath>
            <xpath expr="//field[@name='child_ids']/list//field[@name='date_deadline']" position="after">
                <field name="planned_date_begin" column_invisible="True"/>
            </xpath>
        </field>
     </record>

     <record id="project_sharing_project_task_view_kanban_inherited" model="ir.ui.view">
        <field name="name">project.sharing.project.task.view.kanban.inherit</field>
        <field name="model">project.task</field>
        <field name="inherit_id" ref="project.project_sharing_project_task_view_kanban"/>
        <field name="arch" type="xml">
            <field name="date_deadline" position="attributes">
                <attribute name="invisible">planned_date_begin or not date_deadline or state in ['1_done', '1_canceled']</attribute>
            </field>
            <field name="date_deadline" position="after">
                <div invisible="not planned_date_begin" t-att-class="(luxon.DateTime.fromISO(record.date_deadline.raw_value) &lt; luxon.DateTime.local() and !['1_done', '1_canceled'].includes(record.state.raw_value)) ? 'text-danger' : ''">
                    <field name="planned_date_begin" widget="daterange" options="{'end_date_field': 'date_deadline'}"/>
                </div>
            </field>
        </field>
    </record>

    <record id="project_sharing_project_task_view_tree_inherited" model="ir.ui.view">
        <field name="name">project_enterprise.project.task.view.list.inherit</field>
        <field name="model">project.task</field>
        <field name="inherit_id" ref="project.project_sharing_project_task_view_tree"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='date_deadline']" position="attributes">
                <attribute name="widget">daterange</attribute>
                <attribute name="options">{'start_date_field': 'planned_date_begin'}</attribute>
                <attribute name="decoration-danger">date_deadline &lt; current_date and state not in ['1_done', '1_canceled']</attribute>
            </xpath>
            <xpath expr="//field[@name='date_deadline']" position="after">
                <field name="planned_date_begin" column_invisible="True"/>
            </xpath>
        </field>
    </record>

    <record id="project_sharing_project_task_view_form_inherited_in_gantt" model="ir.ui.view">
        <field name="name">project.task.form.inherited</field>
        <field name="model">project.task</field>
        <field name="mode">primary</field>
        <field name="priority">300</field>
        <field name="inherit_id" ref="project_sharing_project_task_view_form_inherited"/>
        <field name="arch" type="xml">
            <xpath expr="//sheet" position="after">
                <footer>
                    <button string="Save" special="save" data-hotkey="q" class="btn btn-primary" close="1"/>
                    <button name="action_unschedule_task" string="Unschedule" type="object" data-hotkey="u" class="btn btn-secondary" close="1" invisible="not id"/>
                    <button string="Discard" special="cancel" data-hotkey="x" class="btn btn-secondary" close="1"/>
                </footer>
            </xpath>
        </field>
    </record>

    <record id="project_task_view_gantt_inherited_project_sharing_task" model="ir.ui.view">
        <field name="name">project.task.view.gantt.project.sharing.task</field>
        <field name="model">project.task</field>
        <field name="arch" type="xml">
            <gantt date_start="planned_date_begin"
                date_stop="date_deadline"
                default_scale="month"
                scales="day,week,month,quarter,year"
                color="project_id"
                string="Planning"
                js_class="task_sharing_gantt"
                precision="{'day': 'hour:quarter', 'week': 'day:half', 'month': 'day:half'}"
                default_group_by="stage_id"
                pill_label="True"
                total_row="True"
                cell_create="False"
                dependency_field="depend_on_ids"
                dependency_inverted_field="dependent_ids">
                <templates>
                    <div t-name="gantt-popover">
                        <footer replace="0">
                           <button name="action_unschedule_task" type="object" string="Unschedule" class="btn btn-sm btn-secondary"/>
                        </footer>
                    </div>
                </templates>
                <field name="project_id"/>
                <field name="allow_milestones"/>
                <field name="milestone_id"/>
                <field name="portal_user_names"/>
                <field name="partner_id"/>
                <field name="dependent_tasks_count"/>
            </gantt>
        </field>
    </record>

    <record id="project_sharing_task_gantt_action_view" model="ir.actions.act_window.view">
        <field name="sequence" eval="30"/>
        <field name="view_mode">gantt</field>
        <field name="act_window_id" ref="project.project_sharing_project_task_action"/>
        <field name="view_id" ref="project_task_view_gantt_inherited_project_sharing_task"/>
    </record>
</odoo>