Solution : https://service.sap.com/sap/support/notes/448646 (SAP Service marketplace login required)
Key words : 
choose function 'cumulative display', selected horizontal bar display, normal curve view, additional key words, attached program correction, selected capacity line, horizontal bar, cumulative display, histogram display, program error
Related Notes : 
       
| 520802 | CJ2B: Capacity overview and distribution key | 
| 449524 | CJ2B: Bar display within the capacity overview incorrect |