diff --git a/osm_nbi/descriptor_topics.py b/osm_nbi/descriptor_topics.py
index be34d5a..503f82a 100644
--- a/osm_nbi/descriptor_topics.py
+++ b/osm_nbi/descriptor_topics.py
@@ -9,6 +9,10 @@
 from http import HTTPStatus
 from validation import ValidationError, pdu_new_schema, pdu_edit_schema
 from base_topic import BaseTopic, EngineException, get_iterable
+from osm_im.vnfd import vnfd as vnfd_im
+from osm_im.nsd import nsd as nsd_im
+from pyangbind.lib.serialise import pybindJSONDecoder
+import pyangbind.lib.pybindJSON as pybindJSON
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
 
@@ -335,6 +339,29 @@
                                       "future versions", http_code=HTTPStatus.NOT_ACCEPTABLE)
             return self.fs.file_open((storage['folder'], storage['zipfile']), "rb"), accept_zip
 
+    def pyangbind_validation(self, item, data, force=False):
+        try:
+            if item == "vnfds":
+                myvnfd = vnfd_im()
+                pybindJSONDecoder.load_ietf_json({'vnfd:vnfd-catalog': {'vnfd': [data]}}, None, None, obj=myvnfd,
+                                                 path_helper=True, skip_unknown=force)
+                out = pybindJSON.dumps(myvnfd, mode="ietf")
+            elif item == "nsds":
+                mynsd = nsd_im()
+                pybindJSONDecoder.load_ietf_json({'nsd:nsd-catalog': {'nsd': [data]}}, None, None, obj=mynsd,
+                                                 path_helper=True, skip_unknown=force)
+                out = pybindJSON.dumps(mynsd, mode="ietf")
+            else:
+                raise EngineException("Not possible to validate '{}' item".format(item),
+                                      http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+
+            desc_out = self._remove_envelop(yaml.safe_load(out))
+            return desc_out
+
+        except Exception as e:
+            raise EngineException("Error in pyangbind validation: {}".format(str(e)),
+                                  http_code=HTTPStatus.UNPROCESSABLE_ENTITY)
+
 
 class VnfdTopic(DescriptorTopic):
     topic = "vnfds"
@@ -354,8 +381,12 @@
             clean_indata = clean_indata['vnfd-catalog']
         if clean_indata.get('vnfd'):
             if not isinstance(clean_indata['vnfd'], list) or len(clean_indata['vnfd']) != 1:
-                raise EngineException("'vnfd' must be a list only one element")
+                raise EngineException("'vnfd' must be a list of only one element")
             clean_indata = clean_indata['vnfd'][0]
+        elif clean_indata.get('vnfd:vnfd'):
+            if not isinstance(clean_indata['vnfd:vnfd'], list) or len(clean_indata['vnfd:vnfd']) != 1:
+                raise EngineException("'vnfd:vnfd' must be a list of only one element")
+            clean_indata = clean_indata['vnfd:vnfd'][0]
         return clean_indata
 
     def check_conflict_on_del(self, session, _id, force=False):
@@ -388,7 +419,7 @@
 
     def _validate_input_new(self, indata, force=False):
         # TODO validate with pyangbind, serialize
-
+        indata = self.pyangbind_validation("vnfds", indata, force)
         # Cross references validation in the descriptor
         if not indata.get("mgmt-interface"):
             raise EngineException("'mgmt-interface' is a mandatory field and it is not defined",
@@ -546,18 +577,18 @@
             clean_indata = clean_indata['nsd-catalog']
         if clean_indata.get('nsd'):
             if not isinstance(clean_indata['nsd'], list) or len(clean_indata['nsd']) != 1:
-                raise EngineException("'nsd' must be a list only one element")
+                raise EngineException("'nsd' must be a list of only one element")
             clean_indata = clean_indata['nsd'][0]
+        elif clean_indata.get('nsd:nsd'):
+            if not isinstance(clean_indata['nsd:nsd'], list) or len(clean_indata['nsd:nsd']) != 1:
+                raise EngineException("'nsd:nsd' must be a list of only one element")
+            clean_indata = clean_indata['nsd:nsd'][0]
         return clean_indata
 
     def _validate_input_new(self, indata, force=False):
-        # transform constituent-vnfd:member-vnf-index to string
-        if indata.get("constituent-vnfd"):
-            for constituent_vnfd in indata["constituent-vnfd"]:
-                if "member-vnf-index" in constituent_vnfd:
-                    constituent_vnfd["member-vnf-index"] = str(constituent_vnfd["member-vnf-index"])
 
         # TODO validate with pyangbind, serialize
+        indata = self.pyangbind_validation("nsds", indata, force)
         return indata
 
     def _validate_input_edit(self, indata, force=False):