diff --git a/apps/orgs/models.py b/apps/orgs/models.py
index 66286e38e..2e2bbcc29 100644
--- a/apps/orgs/models.py
+++ b/apps/orgs/models.py
@@ -1,5 +1,6 @@
 from django.db import models
 from django.utils.translation import gettext_lazy as _
+from rest_framework.serializers import ValidationError
 
 from common.db.models import JMSBaseModel
 from common.tree import TreeNode
@@ -15,6 +16,7 @@ class OrgRoleMixin:
     DEFAULT_NAME = _('DEFAULT')
     SYSTEM_ID = '00000000-0000-0000-0000-000000000004'
     SYSTEM_NAME = _('SYSTEM')
+    VIRTUAL_IDS = [ROOT_ID, DEFAULT_ID, SYSTEM_ID]
     members: models.Manager
     id: str
 
@@ -171,6 +173,10 @@ class Organization(OrgRoleMixin, JMSBaseModel):
     def is_default(self):
         return str(self.id) == self.DEFAULT_ID
 
+    @property
+    def internal(self):
+        return str(self.id) in self.VIRTUAL_IDS
+
     def change_to(self):
         from .utils import set_current_org
         set_current_org(self)
@@ -223,5 +229,7 @@ class Organization(OrgRoleMixin, JMSBaseModel):
             TicketFlow.objects.filter(org_id=self.id).delete()
 
     def delete(self, *args, **kwargs):
+        if str(self.id) in self.VIRTUAL_IDS:
+            raise ValidationError(_('Can not delete virtual org'))
         self.delete_related_models()
         return super().delete(*args, **kwargs)
diff --git a/apps/orgs/serializers.py b/apps/orgs/serializers.py
index c080332dd..efa1fa311 100644
--- a/apps/orgs/serializers.py
+++ b/apps/orgs/serializers.py
@@ -1,8 +1,8 @@
-from rest_framework.serializers import ModelSerializer
 from rest_framework import serializers
+from rest_framework.serializers import ModelSerializer
 
-from .utils import get_current_org
 from .models import Organization
+from .utils import get_current_org
 
 
 class ResourceStatisticsSerializer(serializers.Serializer):
@@ -25,7 +25,7 @@ class OrgSerializer(ModelSerializer):
         fields_mini = ['id', 'name']
         fields_small = fields_mini + [
             'resource_statistics',
-            'is_default', 'is_root',
+            'is_default', 'is_root', 'internal',
             'date_created', 'created_by',
             'comment', 'created_by',
         ]