In this case I created a graph with different colors for positive and negative values. Crystal Reports version 2011 does not do this automatically. You need to help it.
I started with creating a straightforward vertical bar graph.
and changed it in to this:
In the Chart Expert I picked the tab Color Highlight:
I created two conditions for values below and above the zero line, as you can see.
In this example I experimented with the Access Northwind database. You can download the file here:
You can also download the file through this link: