Solution : https://service.sap.com/sap/support/notes/696937 (SAP Service marketplace login required)
Key words : 
maintain reporting agent settings, older support package versions, 0b            import support package 19, 1c            import support package 13, reporting agent settings, 5            import support package 02, symptom creating variants, 0b support package 19, precalculating web templates, data_mode template attribute
Related Notes : 
       
| 692636 | SAPBWNews BW SP02 NW'04 Stack 02 RIN | 
| 647749 | SAPBWNews BW 3.0B Support Package 19 | 
| 601039 | SAPBWNews BW 3.1 Content Support Package 13 |