Solution : https://service.sap.com/sap/support/notes/432027 (SAP Service marketplace login required)
Key words : 
important customer-specific transactions, current support package level, terms sap support packages, sap support packages case 1, --> sap support package components, current support package status, customer-specific transactions, customer-specific processes, sap patches solution, importing add ons
Related Notes : 
       
| 782140 | OCS: Known problems with Support Packages in Basis Rel. 6.20 | 
| 675156 | SAP APO 3.0A SP26: Release and information note | 
| 641748 | APO Support Package 25 for APO Release 3.0A | 
| 618337 | APO of Support Package 24 for APO Release 3.0A | 
| 590056 | APO Support Package 23 for APO Release 3.0A | 
| 560595 | APO Support Package 22 for APO Release 3.0A | 
| 556962 | FAQ OCS: General information on Support Packages | 
| 532619 | APO Support Package 21 for APO Release 3.0A | 
| 517492 | APO Support Package 20 for APO Release 3.0A | 
| 491882 | APO Support Package 19 for APO Release 3.0A | 
| 459985 | APO Support Package 18 for APO Release 3.0A | 
| 448518 | APO Support Package 17 for APO Release 3.0A | 
| 447925 | OCS: Known problems with Supp. Packages in Basis Rel.6.20 | 
| 438337 | APO Support Package 16 for APO Release 3.0A | 
| 400280 | OCS: Known problems with Support Pkgs in Basis Release 6.10 | 
| 173814 | OCS: Known problems with Support Packages for Release 4.6 | 
| 97630 | OCS: Familiar problems with patches 3.1H-4.0B | 
| 97629 | OCS: Known problems with patches Rel. 4.5 | 
| 97620 | OCS Info: Overview of Important OCS Notes |