Solution : https://service.sap.com/sap/support/notes/484015 (SAP Service marketplace login required)
Key words : 
sap_bw    310sap_bw    30a-30bsap_bw    21csap_bw    20a-20bsap_bw    12a-12b, low level support package, bw support packages separately, import bw support packages, bw support package, support package manager, support packages, support package, import queue, queue reason
Related Notes : 
       
| 770863 | SAP APO 3.1 Stack 09/2004: Release & information note | 
| 743773 | SAP APO 3.1 Stack 07/2004: Release & information note | 
| 681880 | SAP APO 3.1 SP Stack 12/2003: Release & information note | 
| 660704 | SAP APO 3.1 SP Stack 09/2003: Release and information note | 
| 636267 | APO Support Package 16 for APO Release 3.1 | 
| 618326 | APO Support Package 15 for APO Release 3.1 | 
| 595948 | APO Support Package 14 for APO Release 3.1 | 
| 582138 | APO Support Package 13 for APO Release 3.1 | 
| 567583 | APO Support Package 12 for APO Release 3.1 | 
| 560942 | APO Support Package 11 for APO Release 3.1 | 
| 555311 | APO Support Package 10 for APO Release 3.1 | 
| 548798 | Importing SEM-BW and FINBASIS Support Packages | 
| 545480 | APO Support Package 09 for APO Release 3.1 | 
| 534737 | APO Support Package 08 for APO Release 3.1 | 
| 531502 | APO Support Package 7 for APO Release 3.1 | 
| 522797 | APO Support Package 6 for APO Release 3.1 | 
| 516916 | APO Support Package 05 for APO Release 3.1 | 
| 505109 | APO Support Package 04 for APO Release 3.1 | 
| 173814 | OCS: Known problems with Support Packages for Release 4.6 | 
| 149686 | Known problems when applying BW patches (rel. 1.2x) | 
| 110934 | SAP BW Support Packages |