diff --git a/stock_packaging_calculator/models/product.py b/stock_packaging_calculator/models/product.py
index 31e8db70b..4d670716f 100644
--- a/stock_packaging_calculator/models/product.py
+++ b/stock_packaging_calculator/models/product.py
@@ -63,6 +63,7 @@ class Product(models.Model):
 
             {contained: [{id: 1, qty: 4, name: "Big box"}]}
         """
+        self.ensure_one()
         return self._product_qty_by_packaging(
             self._ordered_packaging(), prod_qty, with_contained=with_contained,
         )
@@ -100,12 +101,7 @@ class Product(models.Model):
         for pkg in pkg_by_qty:
             qty_per_pkg, qty = self._qty_by_pkg(pkg.qty, qty)
             if qty_per_pkg:
-                value = {
-                    "id": pkg.id,
-                    "qty": qty_per_pkg,
-                    "name": pkg.name,
-                    "is_unit": pkg.is_unit,
-                }
+                value = self._prepare_qty_by_packaging_values(pkg, qty_per_pkg)
                 if with_contained:
                     contained = None
                     if not pkg.is_unit:
@@ -128,3 +124,11 @@ class Product(models.Model):
             qty -= pkg_qty
             qty_per_pkg += 1
         return qty_per_pkg, qty
+
+    def _prepare_qty_by_packaging_values(self, packaging, qty_per_pkg):
+        return {
+            "id": packaging.id,
+            "qty": qty_per_pkg,
+            "name": packaging.name,
+            "is_unit": packaging.is_unit,
+        }
diff --git a/stock_packaging_calculator/tests/test_packaging_calc.py b/stock_packaging_calculator/tests/test_packaging_calc.py
index 19207c592..c7ab405bd 100644
--- a/stock_packaging_calculator/tests/test_packaging_calc.py
+++ b/stock_packaging_calculator/tests/test_packaging_calc.py
@@ -55,7 +55,7 @@ class TestCalc(SavepointCase):
                         "id": self.uom_unit.id,
                         "qty": 50,
                         "name": self.uom_unit.name,
-                        "is_unit": False,
+                        "is_unit": True,
                     },
                 ],
             },
@@ -86,7 +86,7 @@ class TestCalc(SavepointCase):
                         "id": self.uom_unit.id,
                         "qty": 50,
                         "name": self.uom_unit.name,
-                        "is_unit": False,
+                        "is_unit": True,
                     },
                 ],
             },
@@ -202,7 +202,12 @@ class TestCalc(SavepointCase):
     def test_calc_name_get(self):
         """Test custom name getter."""
         expected = [
-            {"id": self.pkg_pallet.id, "qty": 1, "name": "FOO " + self.pkg_pallet.name},
+            {
+                "id": self.pkg_pallet.id,
+                "qty": 1,
+                "name": "FOO " + self.pkg_pallet.name,
+                "is_unit": False,
+            },
             {
                 "id": self.pkg_big_box.id,
                 "qty": 3,
@@ -242,6 +247,7 @@ class TestCalc(SavepointCase):
                         "id": self.pkg_big_box.id,
                         "qty": 10,
                         "name": self.pkg_big_box.name,
+                        "is_unit": False,
                     },
                 ],
             },
@@ -251,7 +257,12 @@ class TestCalc(SavepointCase):
                 "name": self.pkg_big_box.name,
                 "is_unit": False,
                 "contained": [
-                    {"id": self.pkg_box.id, "qty": 4, "name": self.pkg_box.name},
+                    {
+                        "id": self.pkg_box.id,
+                        "qty": 4,
+                        "name": self.pkg_box.name,
+                        "is_unit": False,
+                    },
                 ],
             },
             {
@@ -260,7 +271,12 @@ class TestCalc(SavepointCase):
                 "name": self.pkg_box.name,
                 "is_unit": False,
                 "contained": [
-                    {"id": self.uom_unit.id, "qty": 50, "name": self.uom_unit.name},
+                    {
+                        "id": self.uom_unit.id,
+                        "qty": 50,
+                        "name": self.uom_unit.name,
+                        "is_unit": True,
+                    },
                 ],
             },
             {
@@ -284,6 +300,7 @@ class TestCalc(SavepointCase):
                 "id": self.pkg_pallet.id,
                 "qty": 1,
                 "name": self.pkg_pallet.name,
+                "is_unit": False,
                 "contained": [
                     {
                         "id": self.pkg_big_box.id,
@@ -299,8 +316,18 @@ class TestCalc(SavepointCase):
                 "name": self.pkg_big_box.name,
                 "is_unit": False,
                 "contained": [
-                    {"id": self.pkg_box.id, "qty": 6, "name": self.pkg_box.name},
-                    {"id": self.uom_unit.id, "qty": 20, "name": self.uom_unit.name},
+                    {
+                        "id": self.pkg_box.id,
+                        "qty": 6,
+                        "name": self.pkg_box.name,
+                        "is_unit": False,
+                    },
+                    {
+                        "id": self.uom_unit.id,
+                        "qty": 20,
+                        "name": self.uom_unit.name,
+                        "is_unit": True,
+                    },
                 ],
             },
             {
@@ -309,7 +336,12 @@ class TestCalc(SavepointCase):
                 "name": self.pkg_box.name,
                 "is_unit": False,
                 "contained": [
-                    {"id": self.uom_unit.id, "qty": 30, "name": self.uom_unit.name},
+                    {
+                        "id": self.uom_unit.id,
+                        "qty": 30,
+                        "name": self.uom_unit.name,
+                        "is_unit": True,
+                    },
                 ],
             },
             {