diff --git a/database_utils/migrate_mano_db.sh b/database_utils/migrate_mano_db.sh
index 4131c9c..f9d4799 100755
--- a/database_utils/migrate_mano_db.sh
+++ b/database_utils/migrate_mano_db.sh
@@ -182,6 +182,7 @@
 [ $OPENMANO_VER_NUM -ge 4043 ] && DATABASE_TARGET_VER_NUM=11  #0.4.43=>  11
 [ $OPENMANO_VER_NUM -ge 4046 ] && DATABASE_TARGET_VER_NUM=12  #0.4.46=>  12
 [ $OPENMANO_VER_NUM -ge 4047 ] && DATABASE_TARGET_VER_NUM=13  #0.4.47=>  13
+[ $OPENMANO_VER_NUM -ge 4057 ] && DATABASE_TARGET_VER_NUM=14  #0.4.57=>  14
 #TODO ... put next versions here
 
 
@@ -625,6 +626,20 @@
     echo "DELETE FROM schema_version WHERE version_int='13';" | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
 }
 
+function upgrade_to_14(){
+    echo "    upgrade database from version 0.13 to version 0.14"
+    echo "      remove unique index vim_net_id, instance_scenario_id at table 'instance_nets'"
+    echo "ALTER TABLE instance_nets DROP INDEX vim_net_id_instance_scenario_id;"  | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
+    echo "ALTER TABLE instance_nets CHANGE COLUMN external created ENUM('true','false') NOT NULL DEFAULT 'false' COMMENT 'Created or already exists at VIM' AFTER multipoint;" | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
+    echo "INSERT INTO schema_version (version_int, version, openmano_ver, comments, date) VALUES (14, '0.14', '0.4.57', 'remove unique index vim_net_id, instance_scenario_id', '2016-09-26');" | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
+}
+function downgrade_from_14(){
+    echo "    downgrade database from version 0.14 to version 0.13"
+    echo "      remove cloud_config at 'scenarios', 'instance_scenarios'"
+    echo "ALTER TABLE instance_nets ADD UNIQUE INDEX vim_net_id_instance_scenario_id (vim_net_id, instance_scenario_id);"  | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
+    echo "ALTER TABLE instance_nets CHANGE COLUMN created external ENUM('true','false') NOT NULL DEFAULT 'false' COMMENT 'If external, means that it already exists at VIM' AFTER multipoint;" | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
+    echo "DELETE FROM schema_version WHERE version_int='14';" | $DBCMD || ! echo "ERROR. Aborted!" || exit -1
+}
 
 function upgrade_to_X(){
     echo "      change 'datacenter_nets'"
diff --git a/nfvo.py b/nfvo.py
index c27c51e..cc2ed7f 100644
--- a/nfvo.py
+++ b/nfvo.py
@@ -1320,6 +1320,7 @@
                 sce_net['vim_id'] = network_id
                 auxNetDict['scenario'][sce_net['uuid']] = network_id
                 rollbackList.append({'what':'network','where':'vim','vim_id':datacenter_id,'uuid':network_id})
+                sce_net["created"] = True
             else:
                 if sce_net['vim_id'] == None:
                     error_text = "Error, datacenter '%s' does not have external network '%s'." % (datacenter_name, sce_net['name'])
@@ -1353,6 +1354,7 @@
                     auxNetDict[sce_vnf['uuid']] = {}
                 auxNetDict[sce_vnf['uuid']][net['uuid']] = network_id
                 rollbackList.append({'what':'network','where':'vim','vim_id':datacenter_id,'uuid':network_id})
+                net["created"] = True
     
         #print "auxNetDict:"
         #print yaml.safe_dump(auxNetDict, indent=4, default_flow_style=False)
@@ -1820,6 +1822,7 @@
                     sce_net["vim_id_sites"][datacenter_id] = network_id
                     auxNetDict['scenario'][sce_net['uuid']][datacenter_id] = network_id
                     rollbackList.append({'what':'network', 'where':'vim', 'vim_id':datacenter_id, 'uuid':network_id})
+                    sce_net["created"] = True
         
     #2. Creating new nets (vnf internal nets) in the VIM"
         #For each vnf net, we create it and we add it to instanceNetlist.
@@ -1843,6 +1846,8 @@
                     auxNetDict[sce_vnf['uuid']] = {}
                 auxNetDict[sce_vnf['uuid']][net['uuid']] = network_id
                 rollbackList.append({'what':'network','where':'vim','vim_id':datacenter_id,'uuid':network_id})
+                net["created"] = True
+
     
         #print "auxNetDict:"
         #print yaml.safe_dump(auxNetDict, indent=4, default_flow_style=False)
@@ -2014,7 +2019,7 @@
     #2.2 deleting NETS
     #net_fail_list=[]
     for net in instanceDict['nets']:
-        if net['external']:
+        if not net['created']:
             continue #skip not created nets
         if not myvim:
             continue
diff --git a/nfvo_db.py b/nfvo_db.py
index 1dcf6f6..9d3b648 100644
--- a/nfvo_db.py
+++ b/nfvo_db.py
@@ -776,7 +776,7 @@
                         sce_net_id = net.get("uuid")
                         
                         for datacenter_site_id,vim_id in net["vim_id_sites"].iteritems():
-                            INSERT_={'vim_net_id': vim_id, 'external': net['external'], 'instance_scenario_id':instance_uuid } #,  'type': net['type']
+                            INSERT_={'vim_net_id': vim_id, 'created': net.get('created', False), 'instance_scenario_id':instance_uuid } #,  'type': net['type']
                             INSERT_['datacenter_id'] = datacenter_site_id 
                             INSERT_['datacenter_tenant_id'] = net.get('datacenter_tenant_id', datacenter_tenant_id) #TODO revise
                             if sce_net_id:
@@ -809,7 +809,7 @@
                         #instance_nets   #nets intraVNF
                         for net in vnf['nets']:
                             net_scene2instance[ net['uuid'] ] = {}
-                            INSERT_={'vim_net_id': net['vim_id'], 'external': 'false', 'instance_scenario_id':instance_uuid  } #,  'type': net['type']
+                            INSERT_={'vim_net_id': net['vim_id'], 'created': net.get('created', False), 'instance_scenario_id':instance_uuid  } #,  'type': net['type']
                             INSERT_['datacenter_id'] = net.get('datacenter_id', datacenter_site_id) 
                             INSERT_['datacenter_tenant_id'] = net.get('datacenter_tenant_id', datacenter_site_tenant_id)
                             if net.get("uuid"):
@@ -935,7 +935,7 @@
                     #from_text = "instance_nets join instance_scenarios on instance_nets.instance_scenario_id=instance_scenarios.uuid " + \
                     #            "join sce_nets on instance_scenarios.scenario_id=sce_nets.scenario_id"
                     #where_text = "instance_nets.instance_scenario_id='"+ instance_dict['uuid'] + "'"
-                    cmd = "SELECT uuid,vim_net_id,status,error_msg,vim_info,external, sce_net_id, net_id as vnf_net_id, datacenter_id, datacenter_tenant_id"\
+                    cmd = "SELECT uuid,vim_net_id,status,error_msg,vim_info,created, sce_net_id, net_id as vnf_net_id, datacenter_id, datacenter_tenant_id"\
                             " FROM instance_nets" \
                             " WHERE instance_scenario_id='{}' ORDER BY created_at".format(instance_dict['uuid'])
                     self.logger.debug(cmd)
@@ -943,7 +943,7 @@
                     instance_dict['nets'] = self.cur.fetchall()
                     
                     db_base._convert_datetime2str(instance_dict)
-                    db_base._convert_str2boolean(instance_dict, ('public','shared','external') )
+                    db_base._convert_str2boolean(instance_dict, ('public','shared','created') )
                     return instance_dict
             except (mdb.Error, AttributeError) as e:
                 self._format_error(e, tries)
diff --git a/openmanod.py b/openmanod.py
index 2fe6187..02c51c8 100755
--- a/openmanod.py
+++ b/openmanod.py
@@ -33,9 +33,9 @@
 '''
 __author__="Alfonso Tierno, Gerardo Garcia, Pablo Montes"
 __date__ ="$26-aug-2014 11:09:29$"
-__version__="0.4.56-r498"
+__version__="0.4.57-r499"
 version_date="Sep 2016"
-database_version="0.13"      #expected database schema version
+database_version="0.14"      #expected database schema version
 
 import httpserver
 import time