Hrm...that's strange if you got it to activate okay.
For other folks that have had issues activating the cheat menu, I've recommended adding a toggle/switch to the camp menu. But the only clean way to do that is through the Module system. The Module System code is in the mod sys tweaks in my signature...the .txt Tweaks in my sig will have a link to a (possibly) out of date .txt tweak that should do the same, but may not work.