I'm using a manual/tutorial for my Language (Dutch) so it might be slightly different.
The English version is viewable @ http://www.qlik.com/uploadedImages/Tutorial.pdf
Check out page 67 under Changing the number format. I dont have to do anything with formulas there.
The thing is, I havent used formulas so far since Im still in the learning phase and just following the tutorial (chapter with barcharts and piecharts.)
So when i follow the 6 instructions to change the number format, the bar graph still shows the total sales per country with 3 decimals.
I also noticed, when you set your fixed decimals to 0 and click apply or OK it resets the box to nothing (empty).
I hope someone could give me a hint to fix this without using formulas since its not required by the tutorial.