diff --git a/addons/account/i18n/account.pot b/addons/account/i18n/account.pot
index 1d26e39b823..73c99b50d46 100644
--- a/addons/account/i18n/account.pot
+++ b/addons/account/i18n/account.pot
@@ -13861,6 +13861,12 @@ msgid ""
 "journal."
 msgstr ""
 
+#. module: account
+#: code:addons/account/models/account_move.py:0
+#, python-format
+msgid "The entry %s (id %s) is already posted."
+msgstr ""
+
 #. module: account
 #: code:addons/account/models/account_move.py:0
 #, python-format
diff --git a/addons/account/models/account_bank_statement.py b/addons/account/models/account_bank_statement.py
index b300992fbe0..644bff3987b 100644
--- a/addons/account/models/account_bank_statement.py
+++ b/addons/account/models/account_bank_statement.py
@@ -410,7 +410,9 @@ class AccountBankStatement(models.Model):
                 statement._set_next_sequence()
 
         self.write({'state': 'posted'})
-        self.line_ids.move_id._post(soft=False)
+        lines_of_moves_to_post = self.line_ids.filtered(lambda line: line.move_id.state != 'posted')
+        if lines_of_moves_to_post:
+            lines_of_moves_to_post.move_id._post(soft=False)
 
     def button_validate(self):
         if any(statement.state != 'posted' or not statement.all_lines_reconciled for statement in self):
diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index f1054cc1073..3b9ac529ba8 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -2490,6 +2490,8 @@ class AccountMove(models.Model):
         if not self.env.su and not self.env.user.has_group('account.group_account_invoice'):
             raise AccessError(_("You don't have the access rights to post an invoice."))
         for move in to_post:
+            if move.state == 'posted':
+                raise UserError(_('The entry %s (id %s) is already posted.') % (move.name, move.id))
             if not move.line_ids.filtered(lambda line: not line.display_type):
                 raise UserError(_('You need to add a line before posting.'))
             if move.auto_post and move.date > fields.Date.context_today(self):
diff --git a/addons/account/tests/test_account_move_entry.py b/addons/account/tests/test_account_move_entry.py
index 450636444aa..e633d218d78 100644
--- a/addons/account/tests/test_account_move_entry.py
+++ b/addons/account/tests/test_account_move_entry.py
@@ -511,8 +511,9 @@ class TestAccountMove(AccountTestInvoicingCommon):
         next.action_post()
         self.assertEqual(next.name, '00000876-G 0002/2021')  # Wait, I didn't want this!
 
+        next.button_draft()
+        next.name = False
         next.journal_id.sequence_override_regex = r'^(?P<seq>\d*)(?P<suffix1>.*?)(?P<year>(\d{4})?)(?P<suffix2>)$'
-        next.name = '/'
         next.action_post()
         self.assertEqual(next.name, '00000877-G 0002/2020')  # Pfew, better!
         next = self.test_move.copy({'date': self.test_move.date})
diff --git a/addons/delivery/tests/test_delivery_stock_move.py b/addons/delivery/tests/test_delivery_stock_move.py
index dff96b036a1..a9d5b7d5be7 100644
--- a/addons/delivery/tests/test_delivery_stock_move.py
+++ b/addons/delivery/tests/test_delivery_stock_move.py
@@ -79,8 +79,6 @@ class StockMoveInvoice(AccountTestInvoicingCommon):
         self.invoice.action_post()
 
         # I pay the invoice.
-        self.invoice = self.sale_prepaid.invoice_ids
-        self.invoice.action_post()
         self.journal = self.AccountJournal.search([('type', '=', 'cash'), ('company_id', '=', self.sale_prepaid.company_id.id)], limit=1)
 
         register_payments = self.env['account.payment.register'].with_context(active_model='account.move', active_ids=self.invoice.ids).create({
diff --git a/addons/point_of_sale/tests/test_point_of_sale_flow.py b/addons/point_of_sale/tests/test_point_of_sale_flow.py
index f8cc739505c..66dda6b08de 100644
--- a/addons/point_of_sale/tests/test_point_of_sale_flow.py
+++ b/addons/point_of_sale/tests/test_point_of_sale_flow.py
@@ -450,7 +450,8 @@ class TestPointOfSaleFlow(TestPointOfSaleCommon):
 
         # I test that the total of the attached invoice is correct
         invoice = self.env['account.move'].browse(res['res_id'])
-        invoice.action_post()
+        if invoice.state != 'posted':
+            invoice.action_post()
         self.assertAlmostEqual(
             invoice.amount_total, self.pos_order_pos1.amount_total, places=2, msg="Invoice not correct")
 
@@ -832,7 +833,8 @@ class TestPointOfSaleFlow(TestPointOfSaleCommon):
 
         # I test that the total of the attached invoice is correct
         invoice = self.env['account.move'].browse(res['res_id'])
-        invoice.action_post()
+        if invoice.state != 'posted':
+            invoice.action_post()
         self.assertAlmostEqual(
             invoice.amount_total, self.pos_order_pos1.amount_total, places=2, msg="Invoice not correct")