diff --git a/src/interdomain/service/topology_abstractor/DltRecordSender.py b/src/interdomain/service/topology_abstractor/DltRecordSender.py
index 5605ae4129b28ddae789726592e8df08d2d8c714..f91d6d547206d921a09a8ef26b836d677db3b072 100644
--- a/src/interdomain/service/topology_abstractor/DltRecordSender.py
+++ b/src/interdomain/service/topology_abstractor/DltRecordSender.py
@@ -45,27 +45,27 @@ class DltRecordSender:
     def add_device(self, topology_id: TopologyId, device: Device) -> None:
         topology_uuid = topology_id.topology_uuid.uuid
         device_uuid = device.device_id.device_uuid.uuid
-        record_uuid = f'{topology_uuid}:device:{device_uuid}'
+        record_uuid = '{:s}:device:{:s}'.format(topology_uuid, device_uuid)
         self._add_record(record_uuid, (topology_id, device))
 
     def add_link(self, topology_id: TopologyId, link: Link) -> None:
         topology_uuid = topology_id.topology_uuid.uuid
         link_uuid = link.link_id.link_uuid.uuid
-        record_uuid = f'{topology_uuid}:link:{link_uuid}'
+        record_uuid = '{:s}:link:{:s}'.format(topology_uuid, link_uuid)
         self._add_record(record_uuid, (topology_id, link))
 
     def add_service(self, topology_id: TopologyId, service: Service) -> None:
         topology_uuid = topology_id.topology_uuid.uuid
         context_uuid = service.service_id.context_id.context_uuid.uuid
         service_uuid = service.service_id.service_uuid.uuid
-        record_uuid = f'{topology_uuid}:service:{context_uuid}/{service_uuid}'
+        record_uuid = '{:s}:service:{:s}/{:s}'.format(topology_uuid, context_uuid, service_uuid)
         self._add_record(record_uuid, (topology_id, service))
 
     def add_slice(self, topology_id: TopologyId, slice_: Slice) -> None:
         topology_uuid = topology_id.topology_uuid.uuid
         context_uuid = slice_.slice_id.context_id.context_uuid.uuid
         slice_uuid = slice_.slice_id.slice_uuid.uuid
-        record_uuid = f'{topology_uuid}:slice:{context_uuid}/{slice_uuid}'
+        record_uuid = '{:s}:slice:{:s}/{:s}'.format(topology_uuid, context_uuid, slice_uuid)
         self._add_record(record_uuid, (topology_id, slice_))
 
     async def commit(self) -> None:
@@ -83,7 +83,6 @@ class DltRecordSender:
                 dlt_device_id.topology_id.CopyFrom(topology_id)  # pylint: disable=no-member
                 dlt_device_id.device_id.CopyFrom(device_id)      # pylint: disable=no-member
                 tasks.append(self.dlt_connector_client.RecordDevice(dlt_device_id))
-#                await self.dlt_connector_client.RecordDevice(dlt_device_id)
             elif isinstance(dlt_record, Link):
                 link_id = dlt_record.link_id
                 if self.dlt_connector_client is None: continue
@@ -91,7 +90,6 @@ class DltRecordSender:
                 dlt_link_id.topology_id.CopyFrom(topology_id)    # pylint: disable=no-member
                 dlt_link_id.link_id.CopyFrom(link_id)            # pylint: disable=no-member
                 tasks.append(self.dlt_connector_client.RecordLink(dlt_link_id))
-                #await self.dlt_connector_client.RecordLink(dlt_link_id)
             elif isinstance(dlt_record, Service):
                 service_id = dlt_record.service_id
                 if self.dlt_connector_client is None: continue
@@ -99,7 +97,6 @@ class DltRecordSender:
                 dlt_service_id.topology_id.CopyFrom(topology_id) # pylint: disable=no-member
                 dlt_service_id.service_id.CopyFrom(service_id)   # pylint: disable=no-member
                 tasks.append(self.dlt_connector_client.RecordService(dlt_service_id))
-                #await self.dlt_connector_client.RecordService(dlt_service_id)
             elif isinstance(dlt_record, Slice):
                 slice_id = dlt_record.slice_id
                 if self.dlt_connector_client is None: continue
@@ -107,7 +104,6 @@ class DltRecordSender:
                 dlt_slice_id.topology_id.CopyFrom(topology_id)   # pylint: disable=no-member
                 dlt_slice_id.slice_id.CopyFrom(slice_id)         # pylint: disable=no-member
                 tasks.append(self.dlt_connector_client.RecordSlice(dlt_slice_id))
-                #await self.dlt_connector_client.RecordSlice(dlt_slice_id)
             else:
                 LOGGER.error(f'Unsupported Record({str(dlt_record)})')