diff --git a/src/open_inwoner/openzaak/migrations/0056_remove_zaaktypeconfig_unique_identificatie_in_catalogus_and_more.py b/src/open_inwoner/openzaak/migrations/0056_remove_zaaktypeconfig_unique_identificatie_in_catalogus_and_more.py
deleted file mode 100644
index 5db9c561e0..0000000000
--- a/src/open_inwoner/openzaak/migrations/0056_remove_zaaktypeconfig_unique_identificatie_in_catalogus_and_more.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# Generated by Django 4.2.16 on 2024-11-22 16:51
-
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ("openzaak", "0055_openzaakconfig_zaken_filter_enabled"),
-    ]
-
-    operations = [
-        migrations.RemoveConstraint(
-            model_name="zaaktypeconfig",
-            name="unique_identificatie_in_catalogus",
-        ),
-        migrations.RemoveConstraint(
-            model_name="zaaktypeinformatieobjecttypeconfig",
-            name="unique_zaaktype_config_informatieobjecttype_url",
-        ),
-        migrations.RemoveConstraint(
-            model_name="zaaktyperesultaattypeconfig",
-            name="unique_zaaktype_config_resultaattype_url",
-        ),
-        migrations.RemoveConstraint(
-            model_name="zaaktypestatustypeconfig",
-            name="unique_zaaktype_config_statustype_url",
-        ),
-    ]
diff --git a/src/open_inwoner/openzaak/models.py b/src/open_inwoner/openzaak/models.py
index 635b901e2d..6cd772e439 100644
--- a/src/open_inwoner/openzaak/models.py
+++ b/src/open_inwoner/openzaak/models.py
@@ -555,6 +555,12 @@ class ZaakTypeConfig(models.Model):
 
     class Meta:
         verbose_name = _("Zaaktype Configuration")
+        constraints = [
+            UniqueConstraint(
+                name="unique_identificatie_in_catalogus",
+                fields=["catalogus", "identificatie"],
+            ),
+        ]
 
     @property
     def catalogus_url(self):
@@ -610,6 +616,12 @@ class ZaakTypeInformatieObjectTypeConfig(models.Model):
 
     class Meta:
         verbose_name = _("Zaaktype Information Object Configuration")
+        constraints = [
+            UniqueConstraint(
+                name="unique_zaaktype_config_informatieobjecttype_url",
+                fields=["zaaktype_config", "informatieobjecttype_url"],
+            )
+        ]
 
     def informatieobjecttype_uuid(self):
         if self.informatieobjecttype_url:
@@ -742,6 +754,12 @@ class ZaakTypeStatusTypeConfig(models.Model):
 
     class Meta:
         verbose_name = _("Zaaktype Statustype Configuration")
+        constraints = [
+            UniqueConstraint(
+                name="unique_zaaktype_config_statustype_url",
+                fields=["zaaktype_config", "statustype_url"],
+            )
+        ]
 
     def __str__(self):
         return f"{self.zaaktype_config.identificatie} - {self.omschrijving} [{self.zaaktype_config.catalogus.base_url}]"
@@ -786,6 +804,12 @@ class ZaakTypeResultaatTypeConfig(models.Model):
 
     class Meta:
         verbose_name = _("Zaaktype Resultaattype Configuration")
+        constraints = [
+            UniqueConstraint(
+                name="unique_zaaktype_config_resultaattype_url",
+                fields=["zaaktype_config", "resultaattype_url"],
+            )
+        ]
 
     def __str__(self):
         return f"{self.zaaktype_config.identificatie} - {self.omschrijving} [{self.zaaktype_config.catalogus.base_url}]"
diff --git a/src/open_inwoner/openzaak/tests/test_import_export.py b/src/open_inwoner/openzaak/tests/test_import_export.py
index 31e9df5fac..5258c54e6d 100644
--- a/src/open_inwoner/openzaak/tests/test_import_export.py
+++ b/src/open_inwoner/openzaak/tests/test_import_export.py
@@ -1,6 +1,7 @@
 import dataclasses
 import io
 import uuid
+from unittest import skip
 
 from django.core.files.storage.memory import InMemoryStorage
 from django.test import TestCase
@@ -526,6 +527,7 @@ def test_import_jsonl_update_statustype_config_missing_zt_config(self):
         self.assertEqual(ZaakTypeStatusTypeConfig.objects.count(), 1)
         self.assertEqual(ZaakTypeResultaatTypeConfig.objects.count(), 1)
 
+    @skip("Disabled for v1.21.4 backport")
     def test_import_jsonl_update_reports_duplicate_db_records(self):
         mocks = ZGWExportImportMockData()
 
@@ -565,6 +567,7 @@ def test_import_jsonl_update_reports_duplicate_db_records(self):
         # check import
         self.assertEqual(import_result, import_expected)
 
+    @skip("Disabled for v1.21.4 backport")
     def test_import_jsonl_update_reports_duplicate_natural_keys_in_upload_file(self):
         mocks = ZGWExportImportMockData(with_dupes=True)