anchor.diff:  	lists:reverse(Acc).
   
   %% @hidden
  -usage_aaa_ipdr(Event, Filters) when is_record(Event, ipdr_wlan) ->
  +usage_ipdr(Event, Filters) when is_record(Event, ipdr_wlan) ->
   	UsageSpec = {struct, [{"id", "PublicWLANAccessUsageSpec"},
   			{"href", ?usageSpecPath ++ "PublicWLANAccessUsageSpec"},
   			{"name", "PublicWLANAccessUsageSpec"}]},
  
positive.code: 		{_, {_, "AAAAccountingUsage"}, []} ->
  			get_last1(ocs_acct, fun usage_aaa_acct/2, Filters);
  		{_, {_, "PublicWLANAccessUsage"}, []} ->
  			get_last1(ocs_acct, fun usage_aaa_ipdr/2, Filters);
  		{_, {_, "HTPPUsage"}, []} ->
  			get_last1(ocs_acct, fun usage_http_transfer/2, Filters);
  		{_, {_, _}, []} ->
  
negative.code: 		{_, {_, "AAAAccountingUsage"}, _Query1} ->
  			query_page1(PageServer, Etag, fun usage_aaa_acct/2, Filters, Start, End);
  		{_, {_, "PublicWLANAccessUsage"}, _Query1} ->
  			query_page1(PageServer, Etag, fun usage_ipdr/2, Filters, Start, End);
  		{_, {_, "VoIPUsage"}, _Query1} ->
  			query_page1(PageServer, Etag, fun usage_ipdr/2, Filters, Start, End);
  		{_, {_, "HTTPTransferUsage"}, _} ->
  			query_page1(PageServer, Etag, fun usage_http_transfer/2, Filters, Start, End);
  		{_, {_, _}, []} ->
  