i have list of operations and list of users
so i want create report with bar chart that value experssion of bar chart is count of operation and category of bar chart users name and series of bar chart operations of users
for example attention to images :
we have two operations(login,logout) , that user had done them. now attention to this image
what is problem ?.when i select more than one user, output of my report is incorrect. what is my wrong ?