GreatProphet loses its ability to Enhance religion once moved away from the Holy City

I tried searching the forums for any topic regarding the Great Prophet losing its ability to enhance your religion.

As normal, The first Great Prophet(GP) was used to start a religion. When the next GP spawned, at first, it had the ability to enhance my religion. But since a City State was just about 10 tiles away from my capital, i tried to first convert some of its population to my religion then go back to my Holy city to enhance my religion.

But as soon as i left the Holy City tile, the button on the left pane was gone and it did not come back even if i returned within the Holy City tile.

I dont know if this is a bug or a way not to exploit the prophet but i just want to share it for everybody's information.



*edit*
http://forums.civfanatics.com/showthread.php?t=472346

pls delete thread, tried using the search function but just found the thread by manually going through the pages.

When you used a GPr to spread religion only once, he can not do anything else than spending his remaining spread religion uses. No enhancing, no holy site, no bug.