diff --git a/apps/authentication/models.py b/apps/authentication/models.py
index 4d12395..a418683 100644
--- a/apps/authentication/models.py
+++ b/apps/authentication/models.py
@@ -146,6 +146,7 @@ class Organization(BaseModel):
     separate_warehouse = models.BooleanField(default=False)
     has_pos = models.BooleanField(default=False)
     additional_data = models.JSONField(default=dict)
+    service_area = models.ManyToManyField(City, related_name='service_area')
 
     def __str__(self):
         return f'{self.name}-{self.type}'
diff --git a/apps/herd/exception.py b/apps/herd/exception.py
index d4b6664..8c0c2ca 100644
--- a/apps/herd/exception.py
+++ b/apps/herd/exception.py
@@ -15,3 +15,22 @@ class DuplicateRancherException(APIException):
 class HerdCapacityException(APIException):
     status_code = status.HTTP_403_FORBIDDEN
     default_detail = "مقدار حجم سبک و سنگین وارد شده از ظرفیت گله بیشتر میباشد"  # noqa
+
+
+class HerdException(APIException):
+    """ if quota is not available """
+
+    status_code = status.HTTP_400_BAD_REQUEST
+    default_detail = "خطا در اطلاعات گله"  # noqa
+    default_code = 'error'
+
+    def __init__(self, message=None, status_code=None, code=None):
+        if status_code is not None:
+            self.status_code = status_code
+
+        detail = {
+            "message": message,
+            "status_code": status_code
+        }
+
+        super().__init__(detail)
diff --git a/apps/herd/web/api/v1/serializers.py b/apps/herd/web/api/v1/serializers.py
index 0c74c81..a9fb02f 100644
--- a/apps/herd/web/api/v1/serializers.py
+++ b/apps/herd/web/api/v1/serializers.py
@@ -5,7 +5,7 @@ from apps.authentication.api.v1.serializers.serializer import (
     ProvinceSerializer,
     CitySerializer
 )
-from apps.herd.exception import HerdCapacityException
+from apps.herd.exception import HerdCapacityException, HerdException
 from apps.herd.models import Herd, Rancher, RancherOrganizationLink
 
 
@@ -70,6 +70,19 @@ class RancherOrganizationLinkSerializer(serializers.ModelSerializer):
         model = RancherOrganizationLink
         fields = '__all__'
 
+    def validate(self, attrs):
+        rancher = attrs['rancher']
+        organization = attrs['organization']
+
+        if self.Meta.model.objects.filter(rancher=rancher, organization=organization).exists():
+            raise HerdException(message="دامدار برای تعاونی مد نظر از قبل وجود دارد", status_code=403)  # noqa
+
+        if self.instance:
+            if rancher.city not in organization.service_area:
+                raise HerdException(message="دامدار در محدوده فعالیت تعاونی قرار ندارد", status_code=403)  # noqa
+
+        return attrs
+
     def to_representation(self, instance):
         representation = super().to_representation(instance)