diff --git a/xos/synchronizer/models/onos.xproto b/xos/synchronizer/models/onos.xproto
index 041d7e4..e3b553a 100644
--- a/xos/synchronizer/models/onos.xproto
+++ b/xos/synchronizer/models/onos.xproto
@@ -6,17 +6,17 @@
     option verbose_name="ONOS Application";
     option owner_class_name="ONOSService";
 
-    required string app_id = 1 [db_index = False, null = False, blank = False];
-    required string dependencies = 2 [help_text="Comma separated list of required applications", db_index = False, null = True, blank = True];
-    optional string url = 3 [help_text="URL at which the application is available, if it needs to be downloaded", db_index = False, null = True, blank = False];
-    optional string version = 4 [db_index = False, null = True, blank = False];
+    required string app_id = 1 [db_index = False];
+    optional string dependencies = 2 [help_text="Comma separated list of required applications", db_index = False];
+    optional string url = 3 [help_text="URL at which the application is available, if it needs to be downloaded", db_index = False];
+    optional string version = 4 [db_index = False];
 }
 
 message ONOSService (Service){
     option verbose_name="ONOS Service";
 
-    required string rest_hostname = 1 [db_index = False, max_length = 255, null = False, content_type = "stripped", blank = False];
-    required int32 rest_port = 2 [default = 8181, null = False, db_index = False, blank = False];
-    required string rest_username = 3 [db_index = False, max_length = 255, null = False, content_type = "stripped", blank = False, default="karaf"];
-    required string rest_password = 4 [db_index = False, max_length = 255, null = False, content_type = "stripped", blank = False, default="karaf"];
+    required string rest_hostname = 1 [db_index = False, max_length = 255, content_type = "stripped"];
+    required int32 rest_port = 2 [default = 8181, db_index = False];
+    required string rest_username = 3 [db_index = False, max_length = 255, content_type = "stripped", default="karaf"];
+    required string rest_password = 4 [db_index = False, max_length = 255, content_type = "stripped", default="karaf"];
 }