diff --git a/openmanod b/openmanod
index 2118075..d3efe22 100755
--- a/openmanod
+++ b/openmanod
@@ -48,8 +48,8 @@
 
 __author__ = "Alfonso Tierno, Gerardo Garcia, Pablo Montes"
 __date__ = "$26-aug-2014 11:09:29$"
-__version__ = "0.5.22-r532"
-version_date = "Aug 2017"
+__version__ = "0.5.23-r533"
+version_date = "Sep 2017"
 database_version = 25      # expected database schema version
 
 global global_config
diff --git a/osm_ro/nfvo.py b/osm_ro/nfvo.py
index af84204..2c6a5a3 100644
--- a/osm_ro/nfvo.py
+++ b/osm_ro/nfvo.py
@@ -777,7 +777,10 @@
     """
     try:
         myvnfd = vnfd_catalog.vnfd()
-        pybindJSONDecoder.load_ietf_json(vnf_descriptor, None, None, obj=myvnfd)
+        try:
+            pybindJSONDecoder.load_ietf_json(vnf_descriptor, None, None, obj=myvnfd)
+        except Exception as e:
+            raise NfvoException("Invalid yang descriptor format " + str(e), HTTP_Bad_Request)
         db_vnfs = []
         db_nets = []
         db_vms = []
@@ -972,7 +975,8 @@
                 # table interfaces (internal/external interfaces)
                 cp_name2iface_uuid = {}
                 cp_name2vm_uuid = {}
-                for iface in chain(vdu.get("internal-interface").itervalues(), vdu.get("external-interface").itervalues()):
+                # for iface in chain(vdu.get("internal-interface").itervalues(), vdu.get("external-interface").itervalues()):
+                for iface in vdu.get("interface").itervalues():
                     iface_uuid = str(uuid4())
                     uuid_list.append(iface_uuid)
                     db_interface = {
@@ -998,9 +1002,9 @@
                     else:
                         raise ValueError("Interface type {} not supported".format(iface.get("virtual-interface").get("type")))
 
-                    if iface.get("vnfd-connection-point-ref"):
+                    if iface.get("external-connection-point-ref"):
                         try:
-                            cp = vnfd.get("connection-point")[iface.get("vnfd-connection-point-ref")]
+                            cp = vnfd.get("connection-point")[iface.get("external-connection-point-ref")]
                             db_interface["external_name"] = get_str(cp, "name", 255)
                             cp_name2iface_uuid[db_interface["external_name"]] = iface_uuid
                             cp_name2vm_uuid[db_interface["external_name"]] = vm_uuid
@@ -1014,11 +1018,11 @@
                                     vnf=vnfd["id"], vdu=vdu["id"], iface=iface["name"],
                                     cp=iface.get("vnfd-connection-point-ref"))
                             )
-                    elif iface.get("vdu-internal-connection-point-ref"):
+                    elif iface.get("internal-connection-point-ref"):
                         try:
                             for vld in vnfd.get("internal-vld").itervalues():
                                 for cp in vld.get("internal-connection-point").itervalues():
-                                    if cp.get("id-ref") == iface.get("vdu-internal-connection-point-ref"):
+                                    if cp.get("id-ref") == iface.get("internal-connection-point-ref"):
                                         db_interface["net_id"] = net_id2uuid[vld.get("id")]
                                         break
                         except KeyError:
@@ -1028,7 +1032,8 @@
                                     vnf=vnfd["id"], vdu=vdu["id"], iface=iface["name"],
                                     cp=iface.get("vdu-internal-connection-point-ref"))
                             )
-
+                    if iface.get("position") is not None:
+                        db_interface["created_at"] = int(iface.get("position")) - 1000
                     db_interfaces.append(db_interface)
 
             # VNF affinity and antiaffinity
@@ -1061,7 +1066,7 @@
                             format(vnf=vnfd["id"], cp=vnfd["mgmt-interface"]["cp"]))
                 mgmt_access["vm_id"] = cp_name2vm_uuid[vnfd["mgmt-interface"]["cp"]]
                 mgmt_access["interface_id"] = cp_name2iface_uuid[vnfd["mgmt-interface"]["cp"]]
-            default_user = get_str(vnfd.get("vnf-configuration").get("config-access", {}).get("ssh-access", {}),
+            default_user = get_str(vnfd.get("vnf-configuration", {}).get("config-access", {}).get("ssh-access", {}),
                                     "default-user", 64)
             if default_user:
                 mgmt_access["default_user"] = default_user
@@ -1986,7 +1991,10 @@
     """
     try:
         mynsd = nsd_catalog.nsd()
-        pybindJSONDecoder.load_ietf_json(nsd_descriptor, None, None, obj=mynsd)
+        try:
+            pybindJSONDecoder.load_ietf_json(nsd_descriptor, None, None, obj=mynsd)
+        except Exception as e:
+            raise NfvoException("Invalid yang descriptor format " + str(e), HTTP_Bad_Request)
         db_scenarios = []
         db_sce_nets = []
         db_sce_vnfs = []
diff --git a/osm_ro/nfvo_db.py b/osm_ro/nfvo_db.py
index 9d1a83c..ccba5a3 100644
--- a/osm_ro/nfvo_db.py
+++ b/osm_ro/nfvo_db.py
@@ -736,6 +736,9 @@
                 {"table2": [ {"column1": value, "column2: value, ... }, {"column1": value, "column2: value, ... }, ...],
                 {"table3": {"column1": value, "column2: value, ... }
             }
+            If tables does not contain the 'created_at', it is generated incrementally with the order of tables. You can
+            provide a integer value, that it is an index multiply by 0.00001 to add to the created time to manually set
+            up and order
         :param uuid_list: list of created uuids, first one is the root (#TODO to store at uuid table)
         :return: None if success,  raise exception otherwise
         """
@@ -752,12 +755,15 @@
                                 row_list = (row_list, )  #create a list with the single value
                             for row in row_list:
                                 if table_name in self.tables_with_created_field:
-                                    created_time_param = created_time + index*0.00001
+                                    if "created_at" in row:
+                                        created_time_param = created_time + row.pop("created_at")*0.00001
+                                    else:
+                                        created_time_param = created_time + index*0.00001
+                                        index += 1
                                 else:
-                                    created_time_param=0
+                                    created_time_param = 0
                                 self._new_row_internal(table_name, row, add_uuid=False, root_uuid=None,
                                                                created_time=created_time_param)
-                                index += 1
                     return
             except (mdb.Error, AttributeError) as e:
                 self._format_error(e, tries)
diff --git a/vnfs/examples/v3_3vdu_vnfd.yaml b/vnfs/examples/v3_3vdu_vnfd.yaml
index 184bdce..2b3470d 100644
--- a/vnfs/examples/v3_3vdu_vnfd.yaml
+++ b/vnfs/examples/v3_3vdu_vnfd.yaml
@@ -32,14 +32,17 @@
             image: 'cirros034'
             #checksum: 
 
-            external-interface:
+            interface:
             # Specify the external interfaces
             # There can be multiple interfaces defined
             -   name: eth0
+                type: EXTERNAL
+                position: 0
                 virtual-interface:
                     type: OM-MGMT
                     bandwidth: '0'
-                vnfd-connection-point-ref: eth0
+                # vnfd-connection-point-ref: eth0
+                external-connection-point-ref: eth0
 
         connection-point:
             -   name: eth0