Solution : https://service.sap.com/sap/support/notes/628707 (SAP Service marketplace login required)
Key words : 
attached source code corrections, terms drilldown reporting, db2 database, report selection, sorting reason, selection logic, db2 databases, prerequisites, releases > 4
Related Notes : 
       
| 392165 | iSeries: Known problems under V5R1M0/V5R2M0 |