anchor.diff:  		TS = list_to_integer(TimeStamp),
   		N = list_to_integer(Serial),
   		Events = ocs_log:acct_query(TS, TS, '_', '_', '_'),
  -		JsonObj = usage_aaa_acct(lists:keyfind(N, 2, Events)),
  +		JsonObj = usage_aaa_acct(lists:keyfind(N, 2, Events), []),
   		Body = mochijson:encode(JsonObj),
   		Headers = [{content_type, "application/json"}],
   		{ok, Headers, Body}
  
positive.code: %% @hidden
  usage_aaa_auth({Milliseconds, N, P, Node,
  		{ServerIP, ServerPort}, {ClientIP, ClientPort}, EventType,
  		RequestAttributes, ResponseAttributes}) ->
  	UsageSpec = {struct, [{id, "AAAAccessUsageSpec"},
  			{href, "/usageManagement/v1/usageSpecification/AAAAccessUsageSpec"},
  			{name, "AAAAccessUsageSpec"}]},
  
negative.code: 					{content_range, ContentRange}],
  			{ok, Headers, Body}
  	end;
  get_acct_usage(_Query, _Filters) ->
  	{error, 400}.
  
  %% @hidden
  filter([H | T], Acc) ->
  	filter(T, lists:keydelete(H, 1, Acc));
  filter([], Acc) ->
  	lists:reverse(Acc).
  
  