anchor.diff:  	true ->
   	    ok;
   	false ->
  +            ?vlog("Unknown USM engine id: "
  +                  "~n      ~p", [MsgAuthEngineID]),
   	    SecData1 = [MsgUserName],
   	    error(usmStatsUnknownEngineIDs, 
   		  ?usmStatsUnknownEngineIDs_instance,
  
positive.code: 			    true;
  			%% OTP-4090 (OTP-3542)
  			false -> 
  			    error(usmStatsNotInTimeWindows,
  				  ?usmStatsNotInTimeWindows_instance,
  				  SecName,
  
negative.code: 		true -> 
  		    ok;
  		false -> 
                      ?vlog("Not authenticated: "
                            "~n      Sec Name: ~p", [SecName]),
  		    error(usmStatsWrongDigests,
  			  ?usmStatsWrongDigests_instance, SecName)
  	    end;
  