If using a Bar Chart try using a Combo Chart and adding an additioanl expression with bar / line unchecked and only Values on Data Points and an expression thatt limits the length of your numbers:
Similar to this example: http://community.qlikview.com/thread/51109
It's a bit of a cowboy workaround but it should work.
All the best,
Matt - Visual Analytics Ltd
Qlikview Design Blog: http://QVDesign.wordpress.com