In the rotary world 100% N1 is used as max continuious power, if the engines are improved through developement this 100% value is recalibrated to the new N1 speed, higher than 100% is permitted but for limited time periods, OEI for example or max take off power.
However if the manufacturer increases certified output without modifying the component then they could authorise say 104% as then new max continuious, Sikorsky have a good example of this with the S76 Gearbox, the original S76A model flew with 100% rotor speed, the same gearbox is now certified at a higher rpm, so now spins at 107% indicated.