diff --git a/shopinvader/services/sale.py b/shopinvader/services/sale.py
index 89961cef1a..1ed4aeef60 100644
--- a/shopinvader/services/sale.py
+++ b/shopinvader/services/sale.py
@@ -1,7 +1,9 @@
 # Copyright 2017 Akretion (http://www.akretion.com).
 # @author Sébastien BEAU <sebastien.beau@akretion.com>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from odoo.exceptions import UserError
 from odoo.osv import expression
+from odoo.tools.translate import _
 
 from odoo.addons.base_rest.components.service import to_int
 from odoo.addons.component.core import Component
@@ -49,6 +51,21 @@ def ask_email_invoice(self, _id):
         self._ask_email_invoice = True
         return self.ask_email(_id)
 
+    def cancel(self, _id):
+        order = self._get(_id)
+        self._cancel(order)
+        return self._to_json(order)[0]
+
+    def reset_to_cart(self, _id):
+        order = self._get(_id)
+        self._cancel(order, reset_to_cart=True)
+        res = self._to_json(order)[0]
+        return {
+            "data": res,
+            "set_session": {"cart_id": res["id"]},
+            "store_cache": {"cart": res},
+        }
+
     # Validator
     def _validator_search(self):
         default_search_validator = self._default_validator_search()
@@ -59,6 +76,12 @@ def _validator_search(self):
     def _validator_ask_email_invoice(self):
         return self._validator_ask_email()
 
+    def _validator_cancel(self):
+        return {}
+
+    def _validator_reset_to_cart(self):
+        return {}
+
     # The following method are 'private' and should be never never NEVER call
     # from the controller.
     # All params are trusted as they have been checked before
@@ -102,6 +125,18 @@ def _get_invoices(self, sale):
         domain_state = invoice_service._get_domain_state()
         return invoices.filtered_domain(domain_state)
 
+    def _cancel(self, sale, reset_to_cart=False):
+        for line in sale.order_line:
+            if line.qty_delivered > 0 or line.qty_invoiced > 0:
+                raise UserError(
+                    _("Orders that have been delivered or invoiced cannot be edited.")
+                )
+        sale.action_cancel()
+        if reset_to_cart:
+            sale.action_draft()
+            sale.typology = "cart"
+        return sale
+
     def _convert_invoices(self, invoices):
         return [self._convert_one_invoice(invoice) for invoice in invoices]
 
diff --git a/shopinvader/tests/__init__.py b/shopinvader/tests/__init__.py
index 086b7fd159..7d0a489385 100644
--- a/shopinvader/tests/__init__.py
+++ b/shopinvader/tests/__init__.py
@@ -9,6 +9,7 @@
 from . import test_product
 from . import test_product_filter
 from . import test_sale
+from . import test_sale_cancel
 from . import test_shopinvader_category
 from . import test_shopinvader_variant_binding_wizard
 from . import test_shopinvader_category_binding_wizard
diff --git a/shopinvader/tests/test_sale.py b/shopinvader/tests/test_sale.py
index df568fde21..1fa2df6979 100644
--- a/shopinvader/tests/test_sale.py
+++ b/shopinvader/tests/test_sale.py
@@ -9,7 +9,7 @@
 from .common import CommonCase, CommonTestDownload
 
 
-class SaleCase(CommonCase, CommonTestDownload):
+class CommonSaleCase(CommonCase):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
@@ -25,10 +25,12 @@ def setUpClass(cls):
         )
 
     def setUp(self, *args, **kwargs):
-        super(SaleCase, self).setUp(*args, **kwargs)
+        super().setUp(*args, **kwargs)
         with self.work_on_services(partner=self.partner) as work:
             self.service = work.component(usage="sales")
 
+
+class SaleCase(CommonSaleCase, CommonTestDownload):
     def _confirm_and_invoice_sale(self):
         self.sale.action_confirm()
         for line in self.sale.order_line:
diff --git a/shopinvader/tests/test_sale_cancel.py b/shopinvader/tests/test_sale_cancel.py
new file mode 100644
index 0000000000..eb64de07d3
--- /dev/null
+++ b/shopinvader/tests/test_sale_cancel.py
@@ -0,0 +1,41 @@
+# Copyright 2021 Akretion (https://www.akretion.com).
+# @author Pierrick Brun <pierrick.brun@akretion.com>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo.exceptions import UserError
+
+from .test_sale import CommonSaleCase
+
+
+class TestSaleCancel(CommonSaleCase):
+    def test_sale_cancel(self):
+        self.sale.action_confirm()
+        self.assertEqual("sale", self.sale.typology)
+        self.assertEqual("sale", self.sale.state)
+
+        self.service.dispatch("cancel", self.sale.id)
+
+        self.assertEqual("cancel", self.sale.state)
+
+    def test_sale_cancel_fail_if_delivered(self):
+        self.sale.action_confirm()
+        # deliver only 1 line
+        self.sale.order_line[0].write({"qty_delivered": 1})
+        self.env["sale.order.line"].flush(records=self.sale.order_line)
+        with self.assertRaises(UserError):
+            self.service.dispatch("cancel", self.sale.id)
+        self.assertEqual("sale", self.sale.typology)
+        self.assertEqual("sale", self.sale.state)
+
+    def test_sale_cancel_to_cart(self):
+        self.sale.action_confirm()
+        self.assertEqual("sale", self.sale.typology)
+        self.assertEqual("sale", self.sale.state)
+
+        result = self.service.dispatch("reset_to_cart", self.sale.id)
+
+        session = result.get("set_session")
+        self.assertEqual("draft", self.sale.state)
+        self.assertEqual("cart", self.sale.typology)
+        self.assertIsInstance(session, dict)
+        self.assertEqual(session.get("cart_id"), self.sale.id)