Comment 4 for bug 1170175

Hy,
 changing the view like that is not allways the best thing to do
first, you can change it directly in the debug mode to confirm that you've done well
 then, when you are sure of the view and the modification
you can do it in the view file
but you must reload the module
for that you can do it by the settings menu or retsart your server with some options in command line
 -d databasename -u modulename
at the end of the openerp-server command
hope it can help
regards