Hi, I have a question about the validity of Hiesenberg's principle when relativity is in action. Hiesenberg's principle tells us that simultaneous measurement of position and momentum can not be done accurately . But relativity tells us that simultaneity is relative , so simultaneous measurement in my frame is not remain simultaneous in others' frame . So can they accurately measure the position and momentum? If they can, then we can transform the data in our frame with the help of lorentz transformation, and we will have the simultaneous position and momentum. CAN IT BE DONE ?