diff --git a/osm_lcm/ROclient.py b/osm_lcm/ROclient.py
index ec31b39..73a1b13 100644
--- a/osm_lcm/ROclient.py
+++ b/osm_lcm/ROclient.py
@@ -104,7 +104,7 @@
     mandatory_for_create = {
         'tenant': ("name", ),
         'vnfd': ("name", "id", "connection-point", "vdu"),
-        'nsd': ("name", "id", "constituent-vnfd"),
+        'nsd': ("name", "id"),
         'ns': ("name", "scenario", "datacenter"),
         'vim': ("name", "vim_url"),
         'vim_account': (),
diff --git a/osm_lcm/ns.py b/osm_lcm/ns.py
index 630c80a..35d80a0 100644
--- a/osm_lcm/ns.py
+++ b/osm_lcm/ns.py
@@ -687,7 +687,7 @@
                 nsd_RO["id"] = RO_osm_nsd_id
                 nsd_RO.pop("_id", None)
                 nsd_RO.pop("_admin", None)
-                for c_vnf in nsd_RO["constituent-vnfd"]:
+                for c_vnf in nsd_RO.get("constituent-vnfd", ()):
                     vnfd_id = c_vnf["vnfd-id-ref"]
                     c_vnf["vnfd-id-ref"] = descriptor_id_2_RO[vnfd_id]
                 desc = await RO.create("nsd", descriptor=nsd_RO)
@@ -875,7 +875,7 @@
             step = "Looking for needed vnfd to configure"
             self.logger.debug(logging_text + step)
 
-            for c_vnf in nsd["constituent-vnfd"]:
+            for c_vnf in nsd.get("constituent-vnfd", ()):
                 vnfd_id = c_vnf["vnfd-id-ref"]
                 vnf_index = str(c_vnf["member-vnf-index"])
                 vnfd = db_vnfds_ref[vnfd_id]