fix - uncomment rancher duplicate eception in pos

apps/herd/pos/api/v1/api.py

@@ -7,6 +7,7 @@ from rest_framework.permissions import AllowAny
 from rest_framework.response import Response
 
 from apps.core.mixins.search_mixin import DynamicSearchMixin
+from apps.herd.exception import DuplicateRancherException
 from apps.herd.models import Herd, Rancher
 from apps.herd.pos.api.v1.serializers import HerdSerializer, RancherSerializer
 from apps.livestock.web.api.v1.serializers import LiveStockSerializer
@@ -140,8 +141,8 @@ class RancherViewSet(viewsets.ModelViewSet, DynamicSearchMixin):
 
         rancher = self.queryset.filter(national_code=request.data['national_code'])
 
-        # if len(rancher) > 1:
-        #     raise DuplicateRancherException()
+        if len(rancher) > 1:
+            raise DuplicateRancherException()
 
         if rancher.exists():
             serializer = self.serializer_class(rancher.first())