Solution : https://service.sap.com/sap/support/notes/454073 (SAP Service marketplace login required)
Key words : 
0b            import support package 20, 1c            import support package 12, prerequisites --- solution bw2, 0b support package 20, 1c support package 12, bw support packages, support package 20, support package 12, support package, 0b patch 20
Related Notes : 
       
| 414728 | SAPBWNews BW 2.1C Support Package 12 | 
| 414723 | SAPBWNews BW 2.0B Support Package 20 |