diff --git a/addons/hr_expense/views/hr_expense_views.xml b/addons/hr_expense/views/hr_expense_views.xml
index 4e6ad936c84..70b6a85d04b 100644
--- a/addons/hr_expense/views/hr_expense_views.xml
+++ b/addons/hr_expense/views/hr_expense_views.xml
@@ -38,12 +38,12 @@
             <field name="name">hr.expense.tree</field>
             <field name="model">hr.expense</field>
             <field name="arch" type="xml">
-                <tree string="Expenses" decoration-bf="message_unread == True" class="o_expense_tree" js_class="hr_expense_tree" decoration-info="state == 'draft'" decoration-muted="state == 'cancel'">
+                <tree string="Expenses" decoration-bf="message_unread == True" class="o_expense_tree" js_class="hr_expense_tree" decoration-info="state == 'draft'" decoration-muted="state == 'cancel'" multi_edit="1">
                     <field name="attachment_number" invisible="True"/>
                     <field name="date" optional="show"/>
                     <field name="name"/>
                     <field name="employee_id"/>
-                    <field name="sheet_id" optional="show" invisible="not context.get('show_report', False)"/>
+                    <field name="sheet_id" optional="show" invisible="not context.get('show_report', False)" readonly="1"/>
                     <field name="payment_mode" optional="show"/>
                     <field name="reference" optional="hide"/>
                     <field name="analytic_account_id" optional="show" groups="analytic.group_analytic_accounting"/>
@@ -56,8 +56,8 @@
                     <field name="total_amount" optional="show" sum="Total Amount" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                     <button name="action_get_attachment_view" string="View Attached Documents" type="object" icon="fa-paperclip" attrs="{'invisible': [('attachment_number', '=', 0)]}"/>
                     <field name="message_unread" invisible="1"/>
-                    <field name="state" optional="show"/>
-                    <field name="company_id" optional="show" groups="base.group_multi_company"/>
+                    <field name="state" optional="show" readonly="1"/>
+                    <field name="company_id" optional="show" groups="base.group_multi_company" readonly="1"/>
                     <field name="activity_exception_decoration"  widget="activity_exception"/>
                 </tree>
             </field>
diff --git a/addons/hr_timesheet/views/project_views.xml b/addons/hr_timesheet/views/project_views.xml
index 342bfc7bc93..0d970bb2785 100644
--- a/addons/hr_timesheet/views/project_views.xml
+++ b/addons/hr_timesheet/views/project_views.xml
@@ -174,9 +174,8 @@
                 <field name="user_id" position="after">
                     <field name="planned_hours" widget="float_time" sum="Initially Planned Hours" optional="show"/>
                     <field name="effective_hours" widget="float_time" sum="Effective Hours" optional="show"/>
-                    <field name="remaining_hours" widget="float_time" sum="Remaining Hours" readonly="1" optional="show"/>
+                    <field name="remaining_hours" widget="float_time" sum="Remaining Hours" optional="show"/>
                     <field name="progress" widget="progressbar" optional="show" groups="hr_timesheet.group_hr_timesheet_user"/>
-                    <field name="effective_hours" widget="float_time" sum="Spent Hours" invisible="1"/>
                 </field>
             </field>
         </record>
diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index decb61cc94b..2b9029c0cd1 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -531,6 +531,11 @@ class Task(models.Model):
     # customer portal: include comment and incoming emails in communication history
     website_message_ids = fields.One2many(domain=lambda self: [('model', '=', self._name), ('message_type', 'in', ['email', 'comment'])])
 
+    @api.constrains('parent_id')
+    def _check_parent_id(self):
+        if not self._check_recursion():
+            raise ValidationError(_('Error! You cannot create recursive hierarchy of tasks.'))
+
     @api.depends('date_deadline')
     def _compute_date_deadline_formatted(self):
         for task in self:
@@ -699,6 +704,8 @@ class Task(models.Model):
 
     def write(self, vals):
         now = fields.Datetime.now()
+        if 'parent_id' in vals and vals['parent_id'] in self.ids:
+            raise UserError(_("Sorry. You can't set a task as its parent task."))
         # stage change: update date_last_stage_update
         if 'stage_id' in vals:
             vals.update(self.update_date_end(vals['stage_id']))
diff --git a/addons/project/views/project_views.xml b/addons/project/views/project_views.xml
index e96ba7ec9cd..d05a8fd48d2 100644
--- a/addons/project/views/project_views.xml
+++ b/addons/project/views/project_views.xml
@@ -672,20 +672,20 @@
             <field name="model">project.task</field>
             <field eval="2" name="priority"/>
             <field name="arch" type="xml">
-                <tree decoration-bf="message_needaction==True" decoration-danger="date_deadline and (date_deadline&lt;current_date)" string="Tasks">
-                    <field name="message_needaction" invisible="1"/>
-                    <field name="sequence" invisible="not context.get('seq_visible', False)"/>
-                    <field name="name"/> 
+                <tree decoration-bf="message_needaction==True" decoration-danger="date_deadline and (date_deadline&lt;current_date)" string="Tasks" multi_edit="1">
+                    <field name="message_needaction" invisible="1" readonly="1"/>
+                    <field name="sequence" invisible="not context.get('seq_visible', False)" readonly="1"/>
+                    <field name="name"/>
                     <!-- YTI TODO user_invisible and seq_visible seem to be useless -->
-                    <field name="project_id" invisible="context.get('user_invisible', False)" optional="show"/>
+                    <field name="project_id" invisible="context.get('user_invisible', False)" optional="show" readonly="1"/>
                     <field name="partner_id" optional="hide"/>
                     <field name="parent_id" groups="project.group_subtask_project" optional="show"/>
                     <field name="user_id" invisible="context.get('user_invisible', False)" optional="show"/>
                     <field name="date_deadline" optional="hide"/>
-                    <field name="stage_id" invisible="context.get('set_visible',False)" optional="show"/>
+                    <field name="stage_id" invisible="context.get('set_visible',False)" optional="show" readonly="1"/>
                     <field name="tag_ids" optional="hide" widget="many2many_tags"/>
                     <field name="company_id" groups="base.group_multi_company" optional="show"/>
-                    <field name="activity_exception_decoration" widget="activity_exception"/>
+                    <field name="activity_exception_decoration" widget="activity_exception" readonly="1"/>
                 </tree>
             </field>
         </record>
diff --git a/addons/sale_expense/views/hr_expense_views.xml b/addons/sale_expense/views/hr_expense_views.xml
index a108cbf3aa2..f18f81249a0 100644
--- a/addons/sale_expense/views/hr_expense_views.xml
+++ b/addons/sale_expense/views/hr_expense_views.xml
@@ -18,8 +18,8 @@
         <field name="inherit_id" ref="hr_expense.view_expenses_tree"/>
         <field name="arch" type="xml">
             <xpath expr="//field[@name='reference']" position="after">
-                <field name="sale_order_id" optional="hide" attrs="{'invisible': [('can_be_reinvoiced', '=', False)]}" options="{'no_create_edit': True, 'no_create': True, 'no_open': True}"  context="{'sale_show_partner_name': True, 'sale_expense_all_order': True}"/>
-                <field name="can_be_reinvoiced" invisible="1"/>
+                <field name="sale_order_id" optional="hide" attrs="{'invisible': [('can_be_reinvoiced', '=', False)]}" options="{'no_create_edit': True, 'no_create': True, 'no_open': True}"  context="{'sale_show_partner_name': True, 'sale_expense_all_order': True}" readonly="1"/>
+                <field name="can_be_reinvoiced" invisible="1" readonly="1"/>
             </xpath>
         </field>
     </record>