Solution : https://service.sap.com/sap/support/notes/362128 (SAP Service marketplace login required)
Key words : 
importing gui patches additional key words sapky20a01, routine corrections optimizer corrections additional notes, optimizer versionadditional notes331554demand planning/kernel 4, //sapservx/specific/apo/apo20/sp12/, 0147519maintenance strategy 'sapgui'0361222sappatch, download apo support package sapky20a12, import additional bw patches, object build 26 sp 120324871 sapapo 2, import apo support packages, import apo support package 12
Related Notes : 
       
| 366878 | |
| 365765 | |
| 361222 | SapPatch: Importing GUI Patches | 
| 356349 | |
| 337603 | UKSymptom | 
| 331554 | Demand Planning/Kernel 4.6D/POSTING_ILLEGAL_STATEMENT | 
| 324871 | |
| 315758 | |
| 188411 | Support Packages for APO Release 2.0A (planned dates ...) | 
| 147519 | Maintenance strategy / deadlines for SAP GUI | 
| 83458 | @19@OCS Info: Patch download from SAP Service Marketplace |