It is hard to see how a bar chart with more than two dimensions would be rendered in a user friendly way.
The QlikView bar chart is limited to two dimensions. You can see this simply by creating a bar chart with two dimensions, and then adding a third dimension in the object.
I think you will be more successful in reflecting on the best way to present your data, rather than the object limitations as such. For example look at Choosing a good chart for basic design directions.