diff --git a/src/openklant/components/klantinteracties/api/tests/test_partijen.py b/src/openklant/components/klantinteracties/api/tests/test_partijen.py
index 9e8cbf7d..28ae51eb 100644
--- a/src/openklant/components/klantinteracties/api/tests/test_partijen.py
+++ b/src/openklant/components/klantinteracties/api/tests/test_partijen.py
@@ -2118,7 +2118,7 @@ def test_invalid_validation_partij_identificator_code_objecttype(self):
         }
 
         # ValidationError, "ObjectType keuzes zijn beperkt op basis van CodeRegister."
-        with self.assertRaises(ValidationError):
+        with self.assertRaises(ValidationError) as error:
             self.client.post(url, data)
 
     def test_invalid_validation_partij_identificator_code_soort_object_id(self):
@@ -2135,7 +2135,7 @@ def test_invalid_validation_partij_identificator_code_soort_object_id(self):
             },
         }
         # "CodeSoortObjectId keuzes zijn beperkt op basis van CodeObjectType.",
-        with self.assertRaises(ValidationError):
+        with self.assertRaises(ValidationError) as error:
             self.client.post(url, data)
 
     def test_invalid_validation_partij_identificator_object_id(self):
@@ -2152,7 +2152,7 @@ def test_invalid_validation_partij_identificator_object_id(self):
             },
         }
         # "De lengte van de ObjectId moet tussen 8 en 9 liggen."
-        with self.assertRaises(ValidationError):
+        with self.assertRaises(ValidationError) as error:
             self.client.post(url, data)
 
     def test_valid_validation_partij_identificator(self):
diff --git a/src/openklant/components/klantinteracties/models/validators.py b/src/openklant/components/klantinteracties/models/validators.py
index 9866b7f7..cbc55b17 100644
--- a/src/openklant/components/klantinteracties/models/validators.py
+++ b/src/openklant/components/klantinteracties/models/validators.py
@@ -56,7 +56,9 @@ def validate_code_object_type(self) -> None:
             return
 
         if self.code_object_type not in self.REGISTERS.get(self.code_register, {}):
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                _("ObjectType keuzes zijn beperkt op basis van CodeRegister.")
+            )
 
     def validate_code_soort_object_id(self) -> None:
         """Validates the CodeSoortObjectId based on register and CodeObjectType"""
@@ -73,7 +75,9 @@ def validate_code_soort_object_id(self) -> None:
             self.code_soort_object_id in d.get(self.code_object_type, [])
             for d in self.REGISTERS.values()
         ):
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                _("CodeSoortObjectId keuzes zijn beperkt op basis van CodeObjectType.")
+            )
 
     def validate_object_id(self) -> None:
         """Validates the object ID based on the SoortObjectId"""
@@ -91,24 +95,35 @@ def validate_object_id(self) -> None:
         if validator:
             validator()
         else:
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                code="object_id",
+                message=(_("Ongeldige Partij Identificator CodeSoortObjectId.")),
+            )
 
     def _validate_bsn(self) -> None:
         """Validates the BSN Object ID length"""
         if len(self.object_id) not in [8, 9]:
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                {"object_id": "De lengte van de ObjectId moet tussen 8 en 9 liggen."}
+            )
 
     def _validate_vestigingsnummer(self) -> None:
         """Validates the VestigingsNummer Object ID length"""
         if len(self.object_id) not in [12]:
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                {"object_id": _("De lengte van de ObjectId moet 12 tekens zijn.")}
+            )
 
     def _validate_rsin(self) -> None:
         """Validates the Rsin Object ID length"""
         if len(self.object_id) not in [8, 9]:
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                {"object_id": _("De lengte van de ObjectId moet tussen 8 en 9 liggen.")}
+            )
 
     def _validate_kvknummer(self) -> None:
         """Validates the KvkNummer Object ID length"""
         if len(self.object_id) not in [8]:
-            raise ValidationError("ERRORE")
+            raise ValidationError(
+                {"object_id": _("De lengte van de ObjectId moet 8 tekens zijn.")}
+            )