anchor.diff:  remove_ref(SessionId)
   		when is_binary(SessionId) ->
   	case catch ets:delete(?NRF_TABLE, SessionId) of
  -		true ->	
  +		true ->
   			ok;
   		{'EXIT', Reason} ->
   			{error, Reason}
  
positive.code: get_usu(#'3gpp_ro_Multiple-Services-Credit-Control'{'Used-Service-Unit' = []}) ->
  	[].
  
  
negative.code: 		'Service-Information' = ServiceInformation,
  		'Service-Context-Id' = SvcContextId,
  		'Event-Timestamp' = EventTimestamp} = Request, SessionId, RequestNum,
  		[{_, Subscriber} | _] = SubscriberIds, OHost, _DHost, ORealm, _DRealm, _IpAddress, _Port, _Class) ->
  	try
  		{Direction, Address} = direction_address(ServiceInformation),
  		ServiceNetwork = service_network(ServiceInformation),
  