diff --git a/src/ralph/dashboards/models.py b/src/ralph/dashboards/models.py
index 8be067c4cf..4e395bafde 100644
--- a/src/ralph/dashboards/models.py
+++ b/src/ralph/dashboards/models.py
@@ -299,9 +299,7 @@ def _default_aggregation_handler(
         )
 
     def build_queryset(self, annotated=True, queryset=None):
-        model = self.model.model_class()
-        model_manager = model._default_manager
-        queryset = queryset or model_manager.all()
+        queryset = queryset or self.model.model_class().objects.all()
 
         grouping_label = GroupingLabel(connection, self.params['labels'])
         if annotated:
diff --git a/src/ralph/operations/migrations/0013_auto_20241002_1122.py b/src/ralph/operations/migrations/0013_auto_20241002_1122.py
new file mode 100644
index 0000000000..1059ca0616
--- /dev/null
+++ b/src/ralph/operations/migrations/0013_auto_20241002_1122.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.8 on 2024-10-02 11:22
+from __future__ import unicode_literals
+
+from django.db import migrations
+import ralph.lib.polymorphic.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('operations', '0012_auto_20211206_1347'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='operation',
+            name='base_objects',
+            field=ralph.lib.polymorphic.fields.PolymorphicManyToManyField(blank=True, related_name='operations', to='assets.BaseObject', verbose_name='objects'),
+        ),
+    ]
diff --git a/src/ralph/operations/models.py b/src/ralph/operations/models.py
index 78302ae53a..7e0b713279 100644
--- a/src/ralph/operations/models.py
+++ b/src/ralph/operations/models.py
@@ -16,6 +16,7 @@
     NamedMixin,
     TaggableMixin
 )
+from ralph.lib.polymorphic.fields import PolymorphicManyToManyField
 
 
 class OperationStatus(AdminAbsoluteUrlMixin, NamedMixin, models.Model):
@@ -96,7 +97,7 @@ class Operation(AdminAbsoluteUrlMixin, TaggableMixin, models.Model):
     resolved_date = models.DateTimeField(
         null=True, blank=True, verbose_name=_('resolved date'),
     )
-    base_objects = models.ManyToManyField(
+    base_objects = PolymorphicManyToManyField(
         BaseObject, related_name='operations', verbose_name=_('objects'),
         blank=True,
     )
diff --git a/src/ralph/supports/migrations/0010_auto_20241002_1122.py b/src/ralph/supports/migrations/0010_auto_20241002_1122.py
new file mode 100644
index 0000000000..e2361d3907
--- /dev/null
+++ b/src/ralph/supports/migrations/0010_auto_20241002_1122.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.8 on 2024-10-02 11:22
+from __future__ import unicode_literals
+
+from django.db import migrations
+import ralph.lib.polymorphic.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('supports', '0009_auto_20240506_1633'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='support',
+            name='base_objects',
+            field=ralph.lib.polymorphic.fields.PolymorphicManyToManyField(related_name='_support_base_objects_+', through='supports.BaseObjectsSupport', to='assets.BaseObject'),
+        ),
+    ]
diff --git a/src/ralph/supports/models.py b/src/ralph/supports/models.py
index 6298df9a5d..cd8c3fbdf1 100644
--- a/src/ralph/supports/models.py
+++ b/src/ralph/supports/models.py
@@ -17,6 +17,7 @@
     NamedMixin,
     PriceMixin
 )
+from ralph.lib.polymorphic.fields import PolymorphicManyToManyField
 from ralph.lib.polymorphic.models import PolymorphicQuerySet
 
 
@@ -131,7 +132,7 @@ class Support(
         default=None,
         null=True,
     )
-    base_objects = models.ManyToManyField(
+    base_objects = PolymorphicManyToManyField(
         BaseObject,
         related_name='+',
         through='BaseObjectsSupport',