Solution : https://service.sap.com/sap/support/notes/561987 (SAP Service marketplace login required)
Summary : 
      This SAP Note consolidates essential directions and prerequisites for applying Support Package 12 (SAPKU30012) for SAP CRM 3.0. Users must review and implement a series of prescriptive notes listed within, particularly noting sections regarding SAP Basis and ABA, before package implementation. It is crucial to update to recommended SAP Kernel versions and check the SAP Service Marketplace for the latest patches to maintain system integrity and avoid known issues. Additionally, it includes guidelines for integrating technical components like CRM Mobile Client Component, SAP JCO, and IPC configs, ensuring all components are harmonized with SP12 requirements.
Key words : 
/patches => download support packages => spam/saint updates => spam update, /patches -> sap maintenance -> sap crm -> sap crm 3, terms enterprise buyer professional edition, /instguides -> sap web application server -> release 6, keine anzeige im produktkatlog recommended, /instguides            -> mysap crm -> sap crm 3, /patches -> sap crm -> sap crm 3, /patches sap crm -> sap crm 3, technical components including mandatory sap notes, structure ofthis note generally reflects
Related Notes : 
       
| 569467 | Installing the SAP ME Client Components | 
| 567967 | Note uppercase of the application WAR files | 
| 560456 | Problems with double sources | 
| 559922 | Remove last filter if only personalized filters | 
| 555759 | Opening Of MS-Word failed while generating Layout | 
| 554714 | Business Rules are not transferred correctly | 
| 553678 | Error on copying document & subsequent r/3 replication | 
| 553088 | Corrections ICSS 3.0 Java version (Patch 4) | 
| 553003 | Entries in the billing due list with very low quantity | 
| 552909 | Dump in org. data download if R/3 version <= 31I | 
| 552537 | CRM Marketing: Mass creation of documents without campaign | 
| 552132 | CRM marketing:Parallel processing maint of campaign export | 
| 552130 | CRM_ORGMAN_DOWNLOAD hanging in "Changes only"-mode | 
| 544970 | Product Error messages in Opportunity and lead | 
| 543841 | CRM: Support Packages Release and Information Notes | 
| 531925 | Exception CX_OS_OBJECT_NOT_RELEASABLE not caught | 
| 526264 | Method execution termination when importing CRM SP SAPKU3000 | 
| 523189 | SAPBWNews BW 2.1C Support Package 21 | 
| 523186 | SAPBWNews BW 2.1C Support Package 20 | 
| 515940 | CRM Mobile Client Component: Upgrade to 3.0 SP12 / 3.1 SP03 | 
| 481278 | Installing qRFC Version 6.20.045 | 
| 446911 | Broadcast messaging service GUI labels are hardcoded | 
| 438015 | Latest qRFC version and supplement for 3.x, 4.x, 6.10, 6.20 | 
| 421281 | |
| 413617 | IPC Installation 3.0 | 
| 167394 | SAP MaxDB: BAD INDEX | 
| 19466 | Downloading SAP kernel patches |