diff --git a/apps/authentication/api/v1/api.py b/apps/authentication/api/v1/api.py
index ae4352d..9a42096 100644
--- a/apps/authentication/api/v1/api.py
+++ b/apps/authentication/api/v1/api.py
@@ -319,7 +319,7 @@ class OrganizationViewSet(BaseViewSet, SoftDeleteMixin, ModelViewSet, DynamicSea
         """ list of organizations by province """
 
         if 'province' in request.GET.keys():
-            queryset = self.get_queryset().filter(province=int(request.GET['province']))
+            queryset = self.get_queryset(show_my_org=True).filter(province=int(request.GET['province']))
         else:
             queryset = self.get_queryset().filter(province=request.user.province)
 
diff --git a/apps/authentication/api/v1/serializers/serializer.py b/apps/authentication/api/v1/serializers/serializer.py
index f31c688..1428157 100644
--- a/apps/authentication/api/v1/serializers/serializer.py
+++ b/apps/authentication/api/v1/serializers/serializer.py
@@ -4,7 +4,7 @@ from django.contrib.auth.hashers import make_password
 from django.db.models import Q
 from rest_framework import serializers
 
-from apps.authentication.exceptions import UserExistException
+from apps.authentication.exceptions import UserExistException, OrganizationNationalUniqueIDException
 from apps.authentication.models import (
     User,
     City,
@@ -224,6 +224,17 @@ class OrganizationSerializer(serializers.ModelSerializer):
         ]
         extra_kwargs = {}
 
+    def validate(self, attrs):
+        national_unique_id = self.context['request'].data['organization']['national_unique_id']
+
+        if not self.instance:
+            if self.Meta.model.objects.filter(national_unique_id=national_unique_id).exists():
+                raise OrganizationNationalUniqueIDException()
+        if self.instance:
+            if self.instance.national_unique_id != national_unique_id:
+                if self.Meta.model.objects.filter(national_unique_id=national_unique_id).exists():
+                    raise OrganizationNationalUniqueIDException()
+
     def to_representation(self, instance):
         """ Custom output """
         representation = super().to_representation(instance)
diff --git a/apps/authentication/exceptions.py b/apps/authentication/exceptions.py
index 73f976c..e703830 100644
--- a/apps/authentication/exceptions.py
+++ b/apps/authentication/exceptions.py
@@ -19,6 +19,14 @@ class OrganizationBankAccountException(APIException):
     default_code = "برای این سازمان حساب بانکی تعریف نشده است"  # noqa
 
 
+class OrganizationNationalUniqueIDException(APIException):
+    """ if organization unique id exist """
+
+    status_code = status.HTTP_403_FORBIDDEN
+    default_detail = _('این شناسه ملی قبلا ثبت شده است')  # noqa
+    default_code = 'organization_unique_id_exist'
+
+
 class UserExistException(APIException):
     """ if user exist """
 
@@ -26,6 +34,7 @@ class UserExistException(APIException):
     default_detail = _('کاربری با این شماره موبایل یا با این نام کاربری از قبل وجود دارد')  # noqa
     default_code = 'user_does_not_exist'
 
+
 class AdminDeleteException(APIException):
     """ admin user can not be deleted """
 
diff --git a/apps/core/api.py b/apps/core/api.py
index 501cff3..76ece9b 100644
--- a/apps/core/api.py
+++ b/apps/core/api.py
@@ -13,7 +13,7 @@ class BaseViewSet(RegionFilterMixin, viewsets.ModelViewSet):
     It applies region-based filtering automatically to GET (list) requests.
     """
 
-    def get_queryset(self):
+    def get_queryset(self, show_my_org: bool = None):
         queryset = super().get_queryset()
         request = self.request
         user = request.user
@@ -29,6 +29,10 @@ class BaseViewSet(RegionFilterMixin, viewsets.ModelViewSet):
                 # get all child orgs
                 child_orgs = get_all_org_child(org)
 
+                # if show_my_org is True, add current org to queryset
+                if show_my_org:
+                    child_orgs.append(org)
+
                 model_name = queryset.model.__name__.lower()
 
                 if model_name == 'userrelations':  # noqa
diff --git a/logs/django_requests.log b/logs/django_requests.log
index 58edc77..c681011 100644
--- a/logs/django_requests.log
+++ b/logs/django_requests.log
@@ -312,3 +312,13 @@ django.core.exceptions.FieldError: Unsupported lookup 'name' for ForeignKey or j
 [2025-10-28 13:50:37,425] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader
 [2025-10-28 13:53:02,285] INFO django.utils.autoreload | IP: - | Path: - | D:\Project\Rasaddam_Backend\apps\authentication\api\v1\api.py changed, reloading.
 [2025-10-28 13:53:05,015] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader
+[2025-10-28 13:54:21,998] INFO django.utils.autoreload | IP: - | Path: - | D:\Project\Rasaddam_Backend\apps\authentication\api\v1\serializers\serializer.py changed, reloading.
+[2025-10-28 13:54:25,611] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader
+[2025-10-28 13:54:54,355] INFO django.utils.autoreload | IP: - | Path: - | D:\Project\Rasaddam_Backend\apps\authentication\api\v1\serializers\serializer.py changed, reloading.
+[2025-10-28 13:54:58,709] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader
+[2025-10-28 14:28:42,019] INFO django.utils.autoreload | IP: - | Path: - | D:\Project\Rasaddam_Backend\apps\authentication\exceptions.py changed, reloading.
+[2025-10-28 14:28:44,198] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader
+[2025-10-28 14:28:53,263] INFO django.utils.autoreload | IP: - | Path: - | D:\Project\Rasaddam_Backend\apps\authentication\api\v1\serializers\serializer.py changed, reloading.
+[2025-10-28 14:28:55,553] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader
+[2025-10-28 14:35:00,268] INFO django.utils.autoreload | IP: - | Path: - | D:\Project\Rasaddam_Backend\apps\core\api.py changed, reloading.
+[2025-10-28 14:35:02,391] INFO django.utils.autoreload | IP: - | Path: - | Watching for file changes with StatReloader