How To Disable Map Voting

Hello,

How can i disable the map voting at the end of the round. In the server configuration window i didn't select that option. So normaly this should be off.
But when i check aagame.ini you see that the value = True.
When i modify this aagame.ini file to = false and i start the server again, it overwrites the aagame.ini file again.
So my modification is gone!

Also the Admin Console commands doesn't work
For example
AdminEnableAARMapvoting bEnableVoting false
This command gives me Bad or missing property 'bEnableVoting'

Anyone who can help me ?
Also the punkbuster commands doesn't work in console. And i cannot set any message of the day for the server.
Any help is appreciated.
greetings