Change the order of bars in the graph of a JRS report

Hello,

I have a report that displays the number of tests cases sorted by their results (in stacked bars) and the "test phase" (in the horizontal axis) (test phase is an attribute created that can take as value Tests phase, Integration tests and Verification tests. I wonder if it possible to change the order of the bars in order to have the "Units tests" bar then the "Integration tests" then the "Validation tests" every time, regardless of the number of tests cases.

Thank you for your help.

Regards,

Victor Macé