diff --git a/kfet/tests/test_views.py b/kfet/tests/test_views.py
index 852d5bf1..853ec449 100644
--- a/kfet/tests/test_views.py
+++ b/kfet/tests/test_views.py
@@ -3358,7 +3358,26 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         )
 
         self.assertDictEqual(
-            json_data, {"canceled": [operation.pk], "errors": {}, "warnings": {}}
+            json_data,
+            {
+                "canceled": [
+                    {
+                        "id": operation.id,
+                        # l'encodage des dates en JSON est relou...
+                        "canceled_at": mock.ANY,
+                        "canceled_by__trigramme": None,
+                    }
+                ],
+                "errors": {},
+                "warnings": {},
+                "opegroups_to_update": [
+                    {
+                        "id": group.pk,
+                        "amount": str(group.amount),
+                        "is_cof": group.is_cof,
+                    }
+                ],
+            },
         )
 
         self.account.refresh_from_db()
@@ -3370,26 +3389,7 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
 
         self.kpsul_consumer_mock.group_send.assert_called_with(
             "kfet.kpsul",
-            {
-                "opegroups": [
-                    {
-                        "cancellation": True,
-                        "id": group.pk,
-                        "amount": Decimal("0.00"),
-                        "is_cof": False,
-                    }
-                ],
-                "opes": [
-                    {
-                        "cancellation": True,
-                        "id": operation.pk,
-                        "canceled_by__trigramme": None,
-                        "canceled_at": self.now + timedelta(seconds=15),
-                    }
-                ],
-                "checkouts": [],
-                "articles": [{"id": self.article.pk, "stock": 22}],
-            },
+            {"checkouts": [], "articles": [{"id": self.article.pk, "stock": 22}]},
         )
 
     def test_purchase_with_addcost(self):
@@ -3546,7 +3546,26 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         )
 
         self.assertDictEqual(
-            json_data, {"canceled": [operation.pk], "errors": {}, "warnings": {}}
+            json_data,
+            {
+                "canceled": [
+                    {
+                        "id": operation.id,
+                        # l'encodage des dates en JSON est relou...
+                        "canceled_at": mock.ANY,
+                        "canceled_by__trigramme": None,
+                    }
+                ],
+                "errors": {},
+                "warnings": {},
+                "opegroups_to_update": [
+                    {
+                        "id": group.pk,
+                        "amount": str(group.amount),
+                        "is_cof": group.is_cof,
+                    }
+                ],
+            },
         )
 
         self.account.refresh_from_db()
@@ -3559,22 +3578,6 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         self.kpsul_consumer_mock.group_send.assert_called_with(
             "kfet.kpsul",
             {
-                "opegroups": [
-                    {
-                        "cancellation": True,
-                        "id": group.pk,
-                        "amount": Decimal("0.00"),
-                        "is_cof": False,
-                    }
-                ],
-                "opes": [
-                    {
-                        "cancellation": True,
-                        "id": operation.pk,
-                        "canceled_by__trigramme": None,
-                        "canceled_at": self.now + timedelta(seconds=15),
-                    }
-                ],
                 "checkouts": [{"id": self.checkout.pk, "balance": Decimal("89.25")}],
                 "articles": [],
             },
@@ -3630,7 +3633,26 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         )
 
         self.assertDictEqual(
-            json_data, {"canceled": [operation.pk], "errors": {}, "warnings": {}}
+            json_data,
+            {
+                "canceled": [
+                    {
+                        "id": operation.id,
+                        # l'encodage des dates en JSON est relou...
+                        "canceled_at": mock.ANY,
+                        "canceled_by__trigramme": None,
+                    }
+                ],
+                "errors": {},
+                "warnings": {},
+                "opegroups_to_update": [
+                    {
+                        "id": group.pk,
+                        "amount": str(group.amount),
+                        "is_cof": group.is_cof,
+                    }
+                ],
+            },
         )
 
         self.account.refresh_from_db()
@@ -3643,22 +3665,6 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         self.kpsul_consumer_mock.group_send.assert_called_with(
             "kfet.kpsul",
             {
-                "opegroups": [
-                    {
-                        "cancellation": True,
-                        "id": group.pk,
-                        "amount": Decimal("0.00"),
-                        "is_cof": False,
-                    }
-                ],
-                "opes": [
-                    {
-                        "cancellation": True,
-                        "id": operation.pk,
-                        "canceled_by__trigramme": None,
-                        "canceled_at": self.now + timedelta(seconds=15),
-                    }
-                ],
                 "checkouts": [{"id": self.checkout.pk, "balance": Decimal("110.75")}],
                 "articles": [],
             },
@@ -3714,7 +3720,26 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         )
 
         self.assertDictEqual(
-            json_data, {"canceled": [operation.pk], "errors": {}, "warnings": {}}
+            json_data,
+            {
+                "canceled": [
+                    {
+                        "id": operation.id,
+                        # l'encodage des dates en JSON est relou...
+                        "canceled_at": mock.ANY,
+                        "canceled_by__trigramme": None,
+                    }
+                ],
+                "errors": {},
+                "warnings": {},
+                "opegroups_to_update": [
+                    {
+                        "id": group.pk,
+                        "amount": str(group.amount),
+                        "is_cof": group.is_cof,
+                    }
+                ],
+            },
         )
 
         self.account.refresh_from_db()
@@ -3725,27 +3750,7 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         self.assertEqual(self.checkout.balance, Decimal("100.00"))
 
         self.kpsul_consumer_mock.group_send.assert_called_with(
-            "kfet.kpsul",
-            {
-                "opegroups": [
-                    {
-                        "cancellation": True,
-                        "id": group.pk,
-                        "amount": Decimal("0.00"),
-                        "is_cof": False,
-                    }
-                ],
-                "opes": [
-                    {
-                        "cancellation": True,
-                        "id": operation.pk,
-                        "canceled_by__trigramme": None,
-                        "canceled_at": self.now + timedelta(seconds=15),
-                    }
-                ],
-                "checkouts": [],
-                "articles": [],
-            },
+            "kfet.kpsul", {"checkouts": [], "articles": []},
         )
 
     @mock.patch("django.utils.timezone.now")
@@ -3966,13 +3971,33 @@ class KPsulCancelOperationsViewTests(ViewTestCaseMixin, TestCase):
         group.refresh_from_db()
         self.assertEqual(group.amount, Decimal("10.75"))
         self.assertEqual(group.opes.exclude(canceled_at=None).count(), 3)
-
+        self.maxDiff = None
         self.assertDictEqual(
             json_data,
             {
-                "canceled": [operation1.pk, operation2.pk],
-                "warnings": {"already_canceled": [operation3.pk]},
+                "canceled": [
+                    {
+                        "id": operation1.id,
+                        # l'encodage des dates en JSON est relou...
+                        "canceled_at": mock.ANY,
+                        "canceled_by__trigramme": None,
+                    },
+                    {
+                        "id": operation2.id,
+                        # l'encodage des dates en JSON est relou...
+                        "canceled_at": mock.ANY,
+                        "canceled_by__trigramme": None,
+                    },
+                ],
                 "errors": {},
+                "warnings": {"already_canceled": [operation3.pk]},
+                "opegroups_to_update": [
+                    {
+                        "id": group.pk,
+                        "amount": str(group.amount),
+                        "is_cof": group.is_cof,
+                    }
+                ],
             },
         )