diff --git a/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_cause.py b/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_cause.py
index 9edaa33778f..1b379f1b0e1 100644
--- a/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_cause.py
+++ b/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_cause.py
@@ -25,13 +25,10 @@ class MgmtsystemNonconformityCause(models.Model):
     )
     ref_code = fields.Char("Reference Code")
 
-    @api.depends("name", "parent_id.name")
+    @api.depends("name", "parent_id.display_name")
     def _compute_display_name(self):
-        res = []
         for obj in self:
             if obj.parent_id:
-                name = obj.parent_id.display_name + " / " + obj.name
+                obj.display_name = f"{obj.parent_id.display_name} / {obj.name}"
             else:
-                name = obj.name
-            res.append((obj.id, name))
-        return res
+                obj.display_name = obj.name
diff --git a/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_origin.py b/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_origin.py
index 9f864dfbeed..97ef27ef32c 100644
--- a/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_origin.py
+++ b/mgmtsystem_nonconformity/models/mgmtsystem_nonconformity_origin.py
@@ -26,10 +26,8 @@ class MgmtsystemNonconformityOrigin(models.Model):
 
     @api.depends("name", "parent_id.name")
     def _compute_display_name(self):
-        res = []
         for obj in self:
             name = obj.name
             if obj.parent_id:
-                name = obj.parent_id.display_name + " / " + name
-            res.append((obj.id, name))
-        return res
+                name = f"{obj.parent_id.display_name} / {name}"
+            obj.display_name = name
diff --git a/mgmtsystem_nonconformity/tests/test_cause.py b/mgmtsystem_nonconformity/tests/test_cause.py
index 7487428e756..8349bc72d32 100644
--- a/mgmtsystem_nonconformity/tests/test_cause.py
+++ b/mgmtsystem_nonconformity/tests/test_cause.py
@@ -24,17 +24,20 @@ def test_create_cause(self):
         self.assertNotEqual(self.record.id, None)
 
     def test_display_name(self):
-        name_assoc = self.record.display_name
-        self.assertEqual(name_assoc[0][1], "TestCause")
-        self.assertEqual(name_assoc[0][0], self.record.id)
-
-        name_assoc = self.record2.display_name
-        self.assertEqual(name_assoc[0][1], "TestCause / test2")
-        self.assertEqual(name_assoc[0][0], self.record2.id)
-
-        name_assoc = self.record3.name_get()
-        self.assertEqual(name_assoc[0][1], "TestCause / test2 / test3")
-        self.assertEqual(name_assoc[0][0], self.record3.id)
+        name_assoc = self.record
+        name_assoc._compute_display_name()
+        self.assertEqual(name_assoc.display_name, "TestCause")
+        self.assertEqual(name_assoc.id, self.record.id)
+
+        name_assoc = self.record2
+        name_assoc._compute_display_name()
+        self.assertEqual(name_assoc.display_name, "TestCause / test2")
+        self.assertEqual(name_assoc.id, self.record2.id)
+
+        name_assoc = self.record3
+        name_assoc._compute_display_name()
+        self.assertEqual(name_assoc.display_name, "TestCause / test2 / test3")
+        self.assertEqual(name_assoc.id, self.record3.id)
 
     def test_recursion(self):
         parent = self.env["mgmtsystem.nonconformity.cause"].create(
diff --git a/mgmtsystem_nonconformity/tests/test_origin.py b/mgmtsystem_nonconformity/tests/test_origin.py
index b4b9b2fa714..cff12f9d1e8 100644
--- a/mgmtsystem_nonconformity/tests/test_origin.py
+++ b/mgmtsystem_nonconformity/tests/test_origin.py
@@ -23,14 +23,17 @@ def test_create_origin(self):
         self.assertNotEqual(self.record.id, None)
 
     def test_display_name(self):
-        name_assoc = self.record.display_name
-        self.assertEqual(name_assoc[0][1], "TestOrigin")
-        self.assertEqual(name_assoc[0][0], self.record.id)
+        name_assoc = self.record
+        name_assoc._compute_display_name()
+        self.assertEqual(name_assoc.display_name, "TestOrigin")
+        self.assertEqual(name_assoc.id, self.record.id)
 
-        name_assoc = self.record2.display_name
-        self.assertEqual(name_assoc[0][1], "TestOrigin / test2")
-        self.assertEqual(name_assoc[0][0], self.record2.id)
+        name_assoc = self.record2
+        name_assoc._compute_display_name()
+        self.assertEqual(name_assoc.display_name, "TestOrigin / test2")
+        self.assertEqual(name_assoc.id, self.record2.id)
 
-        name_assoc = self.record3.display_name
-        self.assertEqual(name_assoc[0][1], "TestOrigin / test2 / test3")
-        self.assertEqual(name_assoc[0][0], self.record3.id)
+        name_assoc = self.record3
+        name_assoc._compute_display_name()
+        self.assertEqual(name_assoc.display_name, "TestOrigin / test2 / test3")
+        self.assertEqual(name_assoc.id, self.record3.id)