diff --git a/addons/hr_expense/__manifest__.py b/addons/hr_expense/__manifest__.py
index 4573b5b3967..6033895df55 100644
--- a/addons/hr_expense/__manifest__.py
+++ b/addons/hr_expense/__manifest__.py
@@ -36,6 +36,7 @@ This module also uses analytic accounting and is compatible with the invoice on
         'data/hr_expense_sequence.xml',
         'data/hr_expense_data.xml',
         'wizard/hr_expense_refuse_reason_views.xml',
+        'wizard/hr_expense_approve_duplicate_views.xml',
         'views/hr_expense_views.xml',
         'views/mail_activity_views.xml',
         'security/ir_rule.xml',
diff --git a/addons/hr_expense/models/hr_expense.py b/addons/hr_expense/models/hr_expense.py
index dd2662b9e52..6ec4833ae34 100644
--- a/addons/hr_expense/models/hr_expense.py
+++ b/addons/hr_expense/models/hr_expense.py
@@ -98,6 +98,8 @@ class HrExpense(models.Model):
         ('refused', 'Refused')
     ], compute='_compute_state', string='Status', copy=False, index=True, readonly=True, store=True, default='draft', help="Status of the expense.")
     sheet_id = fields.Many2one('hr.expense.sheet', string="Expense Report", domain="[('employee_id', '=', employee_id), ('company_id', '=', company_id)]", readonly=True, copy=False)
+    approved_by = fields.Many2one('res.users', string='Approved By', related='sheet_id.user_id')
+    approved_on = fields.Datetime(string='Approved On', related='sheet_id.approval_date')
     reference = fields.Char("Bill Reference")
     is_refused = fields.Boolean("Explicitly Refused by manager or accountant", readonly=True, copy=False)
 
@@ -105,6 +107,8 @@ class HrExpense(models.Model):
     is_ref_editable = fields.Boolean("Reference Is Editable By Current User", compute='_compute_is_ref_editable')
     product_has_cost =  fields.Boolean("Is product with non zero cost selected", compute='_compute_product_has_cost')
     same_currency = fields.Boolean("Is currency_id different from the company_currency_id", compute='_compute_same_currency')
+    duplicate_expense_ids = fields.Many2many('hr.expense', compute='_compute_duplicate_expense_ids')
+
     sample = fields.Boolean()
     label_total_amount_company = fields.Char(compute='_compute_label_total_amount_company')
     label_convert_rate = fields.Char(compute='_compute_label_convert_rate')
@@ -234,6 +238,35 @@ class HrExpense(models.Model):
             for expense in self:
                 expense.employee_id = self.env.user.with_company(expense.company_id).employee_id
 
+    @api.depends('employee_id', 'product_id', 'total_amount')
+    def _compute_duplicate_expense_ids(self):
+        self.duplicate_expense_ids = [(5, 0, 0)]
+
+        expenses = self.filtered(lambda e: e.employee_id and e.product_id and e.total_amount)
+        if expenses.ids:
+            duplicates_query = """
+              SELECT ARRAY_AGG(DISTINCT he.id)
+                FROM hr_expense AS he
+                JOIN hr_expense AS ex ON he.employee_id = ex.employee_id
+                                     AND he.product_id = ex.product_id
+                                     AND he.date = ex.date
+                                     AND he.total_amount = ex.total_amount
+                                     AND he.company_id = ex.company_id
+                                     AND he.currency_id = ex.currency_id
+               WHERE ex.id in %(expense_ids)s
+               GROUP BY he.employee_id, he.product_id, he.date, he.total_amount, he.company_id, he.currency_id
+              HAVING COUNT(he.id) > 1
+            """
+            self.env.cr.execute(duplicates_query, {
+                'expense_ids': tuple(expenses.ids),
+            })
+            duplicates = [x[0] for x in self.env.cr.fetchall()]
+
+            for ids in duplicates:
+                exp = expenses.filtered(lambda e: e.id in ids)
+                exp.duplicate_expense_ids = [(6, 0, ids)]
+                expenses = expenses - exp
+
     @api.onchange('product_id', 'date', 'account_id')
     def _onchange_product_id_date_account_id(self):
         rec = self.env['account.analytic.default'].sudo().account_get(
@@ -364,7 +397,7 @@ Or send your receipts at <a href="mailto:%(email)s?subject=Lunch%%20with%%20cust
         sheet = self.env['hr.expense.sheet'].create({
             'company_id': self.company_id.id,
             'employee_id': self[0].employee_id.id,
-            'name': todo[0].name if len(todo) == 1 else '',
+            'name': todo[0].name if len(todo) == 1 else _('Expense Report'),
             'expense_line_ids': [(6, 0, todo.ids)]
         })
         return sheet
@@ -388,6 +421,14 @@ Or send your receipts at <a href="mailto:%(email)s?subject=Lunch%%20with%%20cust
         res['context'] = {'default_res_model': 'hr.expense', 'default_res_id': self.id}
         return res
 
+    def action_approve_duplicates(self):
+        root = self.env['ir.model.data'].xmlid_to_res_id("base.partner_root")
+        for expense in self.duplicate_expense_ids:
+            expense.message_post(
+                body=_('%(user)s confirms this expense is not a duplicate with similar expense.', user=self.env.user.name),
+                author_id=root
+            )
+
     # ----------------------------------------
     # Business
     # ----------------------------------------
@@ -855,6 +896,7 @@ class HrExpenseSheet(models.Model):
     is_multiple_currency = fields.Boolean("Handle lines with different currencies", compute='_compute_is_multiple_currency')
     can_reset = fields.Boolean('Can Reset', compute='_compute_can_reset')
     can_approve = fields.Boolean('Can Approve', compute='_compute_can_approve')
+    approval_date = fields.Datetime('Approval Date', readonly=True)
 
     _sql_constraints = [
         ('journal_id_required_posted', "CHECK((state IN ('post', 'done') AND journal_id IS NOT NULL) OR (state NOT IN ('post', 'done')))", 'The journal must be set on posted expense'),
@@ -1003,7 +1045,7 @@ class HrExpenseSheet(models.Model):
         self.write({'state': 'submit'})
         self.activity_update()
 
-    def approve_expense_sheets(self):
+    def _check_can_approve(self):
         if not self.user_has_groups('hr_expense.group_hr_expense_team_approver'):
             raise UserError(_("Only Managers and HR Officers can approve expenses"))
         elif not self.user_has_groups('hr_expense.group_hr_expense_manager'):
@@ -1015,8 +1057,21 @@ class HrExpenseSheet(models.Model):
             if not self.env.user in current_managers and not self.user_has_groups('hr_expense.group_hr_expense_user') and self.employee_id.expense_manager_id != self.env.user:
                 raise UserError(_("You can only approve your department expenses"))
 
+    def approve_expense_sheets(self):
+        self._check_can_approve()
+
+        duplicates = self.expense_line_ids.duplicate_expense_ids.filtered(lambda exp: exp.state in ['approved', 'done'])
+        if duplicates:
+            action = self.env["ir.actions.act_window"]._for_xml_id('hr_expense.hr_expense_approve_duplicate_action')
+            action['context'] = {'default_sheet_ids': self.ids, 'default_expense_ids': duplicates.ids}
+            return action
+        self._do_approve()
+
+    def _do_approve(self):
+        self._check_can_approve()
+
         responsible_id = self.user_id.id or self.env.user.id
-        self.write({'state': 'approve', 'user_id': responsible_id})
+        self.write({'state': 'approve', 'user_id': responsible_id, 'approval_date': fields.Datetime.now()})
         self.activity_update()
 
     def paid_expense_sheets(self):
@@ -1043,7 +1098,7 @@ class HrExpenseSheet(models.Model):
         if not self.can_reset:
             raise UserError(_("Only HR Officers or the concerned employee can reset to draft."))
         self.mapped('expense_line_ids').write({'is_refused': False})
-        self.write({'state': 'draft'})
+        self.write({'state': 'draft', 'approval_date': False})
         self.activity_update()
         return True
 
diff --git a/addons/hr_expense/security/ir.model.access.csv b/addons/hr_expense/security/ir.model.access.csv
index 20b500b26c6..9befbc2619a 100644
--- a/addons/hr_expense/security/ir.model.access.csv
+++ b/addons/hr_expense/security/ir.model.access.csv
@@ -15,3 +15,4 @@ access_account_move_line_user,account.move.line.hr.expense.approver,account.mode
 access_account_analytic_line_user,account.analytic.line.user,account.model_account_analytic_line,hr_expense.group_hr_expense_team_approver,1,1,1,1
 access_mail_activity_type_expense_user,mail.activity.type.expense.user,mail.model_mail_activity_type,hr_expense.group_hr_expense_manager,1,1,1,1
 access_hr_expense_refuse_wizard,access.hr.expense.refuse.wizard,model_hr_expense_refuse_wizard,hr_expense.group_hr_expense_team_approver,1,1,1,0
+access_hr_expense_approve_duplicate,access.hr.expense.approve.duplicate,model_hr_expense_approve_duplicate,hr_expense.group_hr_expense_team_approver,1,1,1,0
diff --git a/addons/hr_expense/static/src/js/expense_form_view.js b/addons/hr_expense/static/src/js/expense_form_view.js
new file mode 100644
index 00000000000..f6e3996756d
--- /dev/null
+++ b/addons/hr_expense/static/src/js/expense_form_view.js
@@ -0,0 +1,65 @@
+odoo.define('hr_expense.FormView', function (require) {
+"use strict";
+    var Dialog = require('web.Dialog');
+
+    var FormController = require('web.FormController');
+    var FormView = require('web.FormView');
+
+    var viewRegistry = require('web.view_registry');
+    var core = require('web.core');
+    var _t = core._t;
+
+    var ExpenseFormController = FormController.extend({
+        _onButtonClicked: function (ev) {
+            if (ev.data.attrs.name === "action_submit_expenses") {
+                ev.stopPropagation();
+                var record = this.model.get(this.handle);
+                if (record.data.duplicate_expense_ids.count) {
+                    var _super = this._super.bind(this, ev);
+                    const recordID = record.data.id;
+                    this._showConfirmDialog(_super).then(() => {
+                        return this._rpc({
+                            model: 'hr.expense',
+                            method: 'action_approve_duplicates',
+                            args: [recordID],
+                        });
+                    });
+                } else {
+                    this._super.apply(this, arguments);
+                }
+            } else {
+                this._super.apply(this, arguments);
+            }
+        },
+
+        _showConfirmDialog: function(confirm_callback) {
+            return new Promise(function (resolve, reject) {
+                Dialog.confirm(this, _t("An expense of same category, amount and date already exists."), {
+                    buttons: [
+                        {
+                            text: _t("Save Anyways"),
+                            classes: 'btn-primary',
+                            close: true,
+                            click: function() {
+                                confirm_callback();
+                                resolve();
+                            }
+                        }, {
+                            text: _t("Cancel"),
+                            close: true,
+                            click: reject,
+                        }
+                    ],
+                });
+            });
+        }
+    });
+
+    var ExpenseFormView = FormView.extend({
+        config: _.extend({}, FormView.prototype.config, {
+            Controller: ExpenseFormController,
+        }),
+    });
+
+    viewRegistry.add('hr_expense_form_view', ExpenseFormView);
+});
diff --git a/addons/hr_expense/views/assets.xml b/addons/hr_expense/views/assets.xml
index 2fc4116b41e..e9f2ff60178 100644
--- a/addons/hr_expense/views/assets.xml
+++ b/addons/hr_expense/views/assets.xml
@@ -4,6 +4,7 @@
         <template id="assets_backend" name="HR Expense Assets assets" inherit_id="web.assets_backend">
             <xpath expr="." position="inside">
                 <script type="text/javascript" src="/hr_expense/static/src/js/expense_views.js"/>
+                <script type="text/javascript" src="/hr_expense/static/src/js/expense_form_view.js"/>
                 <script type="text/javascript" src="/hr_expense/static/src/js/expense_qr_code_action.js"/>
                 <script type="text/javascript" src="/hr_expense/static/src/js/upload_mixin.js"/>
             </xpath>
diff --git a/addons/hr_expense/views/hr_expense_views.xml b/addons/hr_expense/views/hr_expense_views.xml
index d149ac8c30a..988588f160f 100644
--- a/addons/hr_expense/views/hr_expense_views.xml
+++ b/addons/hr_expense/views/hr_expense_views.xml
@@ -108,12 +108,12 @@
             <field name="name">hr.expense.view.form</field>
             <field name="model">hr.expense</field>
             <field name="arch" type="xml">
-                <form string="Expenses" class="o_expense_form">
+                <form string="Expenses" class="o_expense_form" js_class="hr_expense_form_view">
                 <header>
-                  <button name="action_submit_expenses" string="Create Report" type="object" class="oe_highlight o_expense_submit" attrs="{'invisible': ['|', ('attachment_number', '&lt;=', 0), ('sheet_id', '!=', False)]}"/>
+                  <button name="action_submit_expenses" string="Create Report" type="object" class="oe_highlight o_expense_submit" attrs="{'invisible': ['|', '|', ('id', '=', False), ('attachment_number', '&lt;=', 0), ('sheet_id', '!=', False)]}"/>
                   <widget name="attach_document" string="Attach Receipt" action="message_post" attrs="{'invisible': ['|', ('attachment_number', '&lt;', 1), ('id','=',False)]}"/>
                   <widget name="attach_document" string="Attach Receipt" action="message_post" highlight="1" attrs="{'invisible': ['|',('attachment_number', '&gt;=', 1), ('id','=',False)]}"/>
-                  <button name="action_submit_expenses" string="Create Report" type="object" class="o_expense_submit" attrs="{'invisible': ['|', ('attachment_number', '&gt;=', 1), ('sheet_id', '!=', False)]}"/>
+                  <button name="action_submit_expenses" string="Create Report" type="object" class="o_expense_submit" attrs="{'invisible': ['|', '|', ('id', '=', False), ('attachment_number', '&gt;=', 1), ('sheet_id', '!=', False)]}"/>
                   <field name="state" widget="statusbar" statusbar_visible="draft,reported,approved,done,refused"/>
                   <button name="action_view_sheet" type="object" string="View Report" class="oe_highlight" attrs="{'invisible': [('sheet_id', '=', False)]}"/>
                 </header>
@@ -174,6 +174,7 @@
                             <field name="analytic_account_id" domain="['|', ('company_id', '=', company_id), ('company_id', '=', False)]" groups="analytic.group_analytic_accounting" attrs="{'readonly': [('is_editable', '=', False)]}"/>
                             <field name="analytic_tag_ids" widget="many2many_tags" groups="analytic.group_analytic_tags" attrs="{'readonly': [('is_editable', '=', False)]}"/>
                             <field name="company_id" groups="base.group_multi_company"/>
+                            <field name="duplicate_expense_ids" invisible="1" />
                         </group><group attrs="{'invisible': [('product_has_cost', '=', True)]}">
                             <label for="payment_mode"/>
                             <div>
diff --git a/addons/hr_expense/wizard/__init__.py b/addons/hr_expense/wizard/__init__.py
index 71e37e58d93..d115204f0a7 100644
--- a/addons/hr_expense/wizard/__init__.py
+++ b/addons/hr_expense/wizard/__init__.py
@@ -2,3 +2,4 @@
 
 from . import hr_expense_refuse_reason
 from . import account_payment_register
+from . import hr_expense_approve_duplicate
diff --git a/addons/hr_expense/wizard/hr_expense_approve_duplicate.py b/addons/hr_expense/wizard/hr_expense_approve_duplicate.py
new file mode 100644
index 00000000000..680a02763eb
--- /dev/null
+++ b/addons/hr_expense/wizard/hr_expense_approve_duplicate.py
@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models, _
+
+
+class HrExpenseApproveDuplicate(models.TransientModel):
+    """
+    This wizard is shown whenever an approved expense is similar to one being
+    approved. The user has the opportunity to still validate it or decline.
+    """
+
+    _name = "hr.expense.approve.duplicate"
+    _description = "Expense Approve Duplicate"
+
+    sheet_ids = fields.Many2many('hr.expense.sheet')
+    expense_ids = fields.Many2many('hr.expense', readonly=True)
+
+    @api.model
+    def default_get(self, fields):
+        res = super().default_get(fields)
+
+        if 'sheet_ids' in fields:
+            res['sheet_ids'] = [(6, 0, self.env.context.get('default_sheet_ids', []))]
+        if 'duplicate_expense_ids' in fields:
+            res['expense_ids'] = [(6, 0, self.env.context.get('default_expense_ids', []))]
+
+        return res
+
+    def action_approve(self):
+        self.sheet_ids._do_approve()
+
+    def action_refuse(self):
+        self.sheet_ids.refuse_sheet(_('Duplicate Expense'))
diff --git a/addons/hr_expense/wizard/hr_expense_approve_duplicate_views.xml b/addons/hr_expense/wizard/hr_expense_approve_duplicate_views.xml
new file mode 100644
index 00000000000..62d84c808ec
--- /dev/null
+++ b/addons/hr_expense/wizard/hr_expense_approve_duplicate_views.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="hr_expense_approve_duplicate_view_form" model="ir.ui.view">
+        <field name="model">hr.expense.approve.duplicate</field>
+        <field name="arch" type="xml">
+            <form string="Expense Validate Duplicate">
+                <field name="sheet_ids" invisible="1" />
+                <p>The following approved expenses have similar employee, amount and category than some expenses of this report. Please verify this report does not contain duplicates.</p>
+                <field name="expense_ids" nolabel="1">
+                    <tree>
+                        <field name="date" readonly="1" />
+                        <field name="employee_id" readonly="1" />
+                        <field name="product_id" readonly="1" />
+                        <field name="total_amount_company" readonly="1" />
+                        <field name="name" readonly="1" />
+                        <field name="approved_by" readonly="1" />
+                        <field name="approved_on" readonly="1" />
+                    </tree>
+                </field>
+                <footer>
+                    <button string="Refuse" class="btn-primary" name="action_refuse" type="object" attrs="{'invisible': [('sheet_ids', '=', [])]}" />
+                    <button string="Approve" class="btn-secondary" name="action_approve" type="object" attrs="{'invisible': [('sheet_ids', '=', [])]}" />
+                    <button string="Cancel" class="btn-secondary" special="cancel"/>
+                </footer>
+           </form>
+        </field>
+    </record>
+
+    <record id="hr_expense_approve_duplicate_action" model="ir.actions.act_window">
+        <field name="name">Validate Duplicate Expenses</field>
+        <field name="res_model">hr.expense.approve.duplicate</field>
+        <field name="view_mode">form</field>
+        <field name="view_id" ref="hr_expense_approve_duplicate_view_form"/>
+        <field name="target">new</field>
+    </record>
+</odoo>