diff --git a/xos/models/models.py b/xos/models/models.py
new file mode 100644
index 0000000..2e7df7b
--- /dev/null
+++ b/xos/models/models.py
@@ -0,0 +1,60 @@
+from core.models import Service
+from xos.exceptions import XOSValidationError
+
+from models_decl import ProgranService_decl
+from models_decl import ENodeB_decl
+from models_decl import Handover_decl
+from models_decl import ProgranServiceInstance_decl
+
+
+
+
+
+
+
+class ProgranService(ProgranService_decl):
+    class Meta:
+        proxy = True
+
+
+class ENodeB(ENodeB_decl):
+    class Meta:
+        proxy = True
+
+
+class Handover(Handover_decl):
+    class Meta:
+        proxy = True
+
+
+class ProgranServiceInstance(ProgranServiceInstance_decl):
+    class Meta:
+        proxy = True
+
+    def save(self, *args, **kwargs):
+        # NOTE someone is setting owner_id, so just override it for now
+        # if not self.owner_id:
+        services = Service.objects.all()
+        services = [s for s in services if s.name.lower() == 'progran']
+
+        # NOTE select the correct owner
+        try:
+            progran_service = services[0]
+            self.owner_id = progran_service.id
+        except IndexError:
+            raise XOSValidationError("Service Progran cannot be found, please make sure that the model exists.")
+
+        # NOTE if the instance is new, check that the name is not duplicated
+        instances_with_same_name = None
+        if self.pk is None:
+            try:
+                instances_with_same_name = ProgranServiceInstance.objects.get(name=self.name)
+            except self.DoesNotExist:
+                # it's ok not to find anything here
+                pass
+
+        if instances_with_same_name:
+            raise XOSValidationError("A ProgranServiceInstance with name '%s' already exists" % self.name)
+        super(ProgranServiceInstance, self).save(*args, **kwargs)
+
+