Solution : https://service.sap.com/sap/support/notes/312240 (SAP Service marketplace login required)
Key words : 
additional key words report painter, attached source code corrections, report painter reports, cosb ----- supportguide 20010627070826 -----reportwriter, f4-input helps, report painter, report writer, progress data, progress analysis, cnse5 12eva1
Related Notes : 
       
| 668513 | FAQ 2: Cost element reports in Project System | 
| 612339 | |
| 603443 |