diff --git a/osm_ro/nfvo.py b/osm_ro/nfvo.py
index f5ffe09..bf32c24 100644
--- a/osm_ro/nfvo.py
+++ b/osm_ro/nfvo.py
@@ -3687,7 +3687,7 @@
 
     # 2.3 deleting VNFFGs
 
-    for sfp in instanceDict['sfps']:
+    for sfp in instanceDict.get('sfps', ()):
         vimthread_affected[sfp["datacenter_tenant_id"]] = None
         datacenter_key = (sfp["datacenter_id"], sfp["datacenter_tenant_id"])
         if datacenter_key not in myvims:
@@ -3724,7 +3724,7 @@
         task_index += 1
         db_vim_actions.append(db_vim_action)
 
-    for sf in instanceDict['sfs']:
+    for sf in instanceDict.get('sfs', ()):
         vimthread_affected[sf["datacenter_tenant_id"]] = None
         datacenter_key = (sf["datacenter_id"], sf["datacenter_tenant_id"])
         if datacenter_key not in myvims:
@@ -3761,7 +3761,7 @@
         task_index += 1
         db_vim_actions.append(db_vim_action)
 
-    for sfi in instanceDict['sfis']:
+    for sfi in instanceDict.get('sfis', ()):
         vimthread_affected[sfi["datacenter_tenant_id"]] = None
         datacenter_key = (sfi["datacenter_id"], sfi["datacenter_tenant_id"])
         if datacenter_key not in myvims:
diff --git a/osm_ro/nfvo_db.py b/osm_ro/nfvo_db.py
index e9db479..87e3f1e 100644
--- a/osm_ro/nfvo_db.py
+++ b/osm_ro/nfvo_db.py
@@ -1025,25 +1025,25 @@
                     self.cur.execute(cmd)
                     instance_dict['sfps'] = self.cur.fetchall()
 
-                    for sfp in instance_dict['sfps']:
-                        #instance_sfs
-                        cmd = "SELECT uuid,vim_sf_id,sce_rsp_hop_id,datacenter_id,"\
-                              "datacenter_tenant_id,status,error_msg,vim_info"\
-                                " FROM instance_sfs" \
-                                " WHERE instance_scenario_id='{}' ORDER BY created_at".format(instance_dict['uuid']) # TODO: replace instance_scenario_id with instance_sfp_id
-                        self.logger.debug(cmd)
-                        self.cur.execute(cmd)
-                        instance_dict['sfs'] = self.cur.fetchall()
+                    # for sfp in instance_dict['sfps']:
+                    #instance_sfs
+                    cmd = "SELECT uuid,vim_sf_id,sce_rsp_hop_id,datacenter_id,"\
+                          "datacenter_tenant_id,status,error_msg,vim_info"\
+                            " FROM instance_sfs" \
+                            " WHERE instance_scenario_id='{}' ORDER BY created_at".format(instance_dict['uuid']) # TODO: replace instance_scenario_id with instance_sfp_id
+                    self.logger.debug(cmd)
+                    self.cur.execute(cmd)
+                    instance_dict['sfs'] = self.cur.fetchall()
 
-                        for sf in instance_dict['sfs']:
-                            #instance_sfis
-                            cmd = "SELECT uuid,vim_sfi_id,sce_rsp_hop_id,datacenter_id,"\
-                                  "datacenter_tenant_id,status,error_msg,vim_info"\
-                                    " FROM instance_sfis" \
-                                    " WHERE instance_scenario_id='{}' ORDER BY created_at".format(instance_dict['uuid']) # TODO: replace instance_scenario_id with instance_sf_id
-                            self.logger.debug(cmd)
-                            self.cur.execute(cmd)
-                            instance_dict['sfis'] = self.cur.fetchall()
+                    #for sf in instance_dict['sfs']:
+                    #instance_sfis
+                    cmd = "SELECT uuid,vim_sfi_id,sce_rsp_hop_id,datacenter_id,"\
+                          "datacenter_tenant_id,status,error_msg,vim_info"\
+                            " FROM instance_sfis" \
+                            " WHERE instance_scenario_id='{}' ORDER BY created_at".format(instance_dict['uuid']) # TODO: replace instance_scenario_id with instance_sf_id
+                    self.logger.debug(cmd)
+                    self.cur.execute(cmd)
+                    instance_dict['sfis'] = self.cur.fetchall()
 #                            for sfi in instance_dict['sfi']:
 
                     #instance_classifications
diff --git a/osm_ro/vimconn_openstack.py b/osm_ro/vimconn_openstack.py
index e8263ad..fd16f54 100644
--- a/osm_ro/vimconn_openstack.py
+++ b/osm_ro/vimconn_openstack.py
@@ -36,7 +36,7 @@
 __date__  = "$22-sep-2017 23:59:59$"
 
 import vimconn
-import json
+# import json
 import logging
 import netaddr
 import time
@@ -493,9 +493,10 @@
         self.logger.debug("Getting network from VIM filter: '%s'", str(filter_dict))
         try:
             self._reload_connection()
-            if self.api_version3 and "tenant_id" in filter_dict:
-                filter_dict['project_id'] = filter_dict.pop('tenant_id') #TODO check
-            net_dict = self.neutron.list_networks(**filter_dict)
+            filter_dict_os = filter_dict.copy()
+            if self.api_version3 and "tenant_id" in filter_dict_os:
+                filter_dict_os['project_id'] = filter_dict_os.pop('tenant_id')  #T ODO check
+            net_dict = self.neutron.list_networks(**filter_dict_os)
             net_list = net_dict["networks"]
             self.__net_os2mano(net_list)
             return net_list
@@ -840,9 +841,9 @@
         self.logger.debug("Getting image list from VIM filter: '%s'", str(filter_dict))
         try:
             self._reload_connection()
-            filter_dict_os=filter_dict.copy()
+            filter_dict_os = filter_dict.copy()
             #First we filter by the available filter fields: name, id. The others are removed.
-            filter_dict_os.pop('checksum',None)
+            filter_dict_os.pop('checksum', None)
             image_list = self.nova.images.findall(**filter_dict_os)
             if len(image_list) == 0:
                 return []
@@ -851,7 +852,7 @@
             for image in image_list:
                 try:
                     image_class = self.glance.images.get(image.id)
-                    if 'checksum' not in filter_dict or image_class['checksum']==filter_dict.get('checksum'):
+                    if 'checksum' not in filter_dict or image_class['checksum'] == filter_dict.get('checksum'):
                         filtered_list.append(image_class.copy())
                 except gl1Exceptions.HTTPNotFound:
                     pass
@@ -1717,12 +1718,13 @@
         self.logger.debug("Getting Classifications from VIM filter: '%s'",
                           str(filter_dict))
         try:
+            filter_dict_os = filter_dict.copy()
             self._reload_connection()
-            if self.api_version3 and "tenant_id" in filter_dict:
-                filter_dict['project_id'] = filter_dict.pop('tenant_id')
+            if self.api_version3 and "tenant_id" in filter_dict_os:
+                filter_dict_os['project_id'] = filter_dict_os.pop('tenant_id')
             classification_dict = self.neutron.list_sfc_flow_classifiers(
-                **filter_dict)
-            classification_list = cliassification_dict["flow_classifiers"]
+                **filter_dict_os)
+            classification_list = classification_dict["flow_classifiers"]
             self.__classification_os2mano(classification_list)
             return classification_list
         except (neExceptions.ConnectionFailed, ksExceptions.ClientException,
@@ -1796,9 +1798,10 @@
                           "VIM filter: '%s'", str(filter_dict))
         try:
             self._reload_connection()
-            if self.api_version3 and "tenant_id" in filter_dict:
-                filter_dict['project_id'] = filter_dict.pop('tenant_id')
-            sfi_dict = self.neutron.list_sfc_port_pairs(**filter_dict)
+            filter_dict_os = filter_dict.copy()
+            if self.api_version3 and "tenant_id" in filter_dict_os:
+                filter_dict_os['project_id'] = filter_dict_os.pop('tenant_id')
+            sfi_dict = self.neutron.list_sfc_port_pairs(**filter_dict_os)
             sfi_list = sfi_dict["port_pairs"]
             self.__sfi_os2mano(sfi_list)
             return sfi_list
@@ -1868,9 +1871,10 @@
                           str(filter_dict))
         try:
             self._reload_connection()
-            if self.api_version3 and "tenant_id" in filter_dict:
-                filter_dict['project_id'] = filter_dict.pop('tenant_id')
-            sf_dict = self.neutron.list_sfc_port_pair_groups(**filter_dict)
+            filter_dict_os = filter_dict.copy()
+            if self.api_version3 and "tenant_id" in filter_dict_os:
+                filter_dict_os['project_id'] = filter_dict_os.pop('tenant_id')
+            sf_dict = self.neutron.list_sfc_port_pair_groups(**filter_dict_os)
             sf_list = sf_dict["port_pair_groups"]
             self.__sf_os2mano(sf_list)
             return sf_list
@@ -1937,9 +1941,10 @@
                           "'%s'", str(filter_dict))
         try:
             self._reload_connection()
-            if self.api_version3 and "tenant_id" in filter_dict:
-                filter_dict['project_id'] = filter_dict.pop('tenant_id')
-            sfp_dict = self.neutron.list_sfc_port_chains(**filter_dict)
+            filter_dict_os = filter_dict.copy()
+            if self.api_version3 and "tenant_id" in filter_dict_os:
+                filter_dict_os['project_id'] = filter_dict_os.pop('tenant_id')
+            sfp_dict = self.neutron.list_sfc_port_chains(**filter_dict_os)
             sfp_list = sfp_dict["port_chains"]
             self.__sfp_os2mano(sfp_list)
             return sfp_list