Solution : https://service.sap.com/sap/support/notes/331407 (SAP Service marketplace login required)
Key words : 
package manager creates backup copies, apply additional iac packages, apply additional packages, dual-host installations, sap service marketplace, packages previously installed, server components cd, starting program packman, additional patch process, install additional packages
Related Notes : 
       
| 889588 | SAP Internet Transaction Server Inst. 6.20-Patch20 or higher | 
| 710969 | CLPSDP: Usability improvements | 
| 648256 | German umlauts in templates in IAC packages | 
| 648206 | Version information incorrect in *_version.txt | 
| 619010 | WP2.11:Script Error while Logout | 
| 577845 | CLP 40: Install ITS services for APO Collaborative Planning | 
| 550554 | FAQ ITS Support Package 6.20 | 
| 526835 | SAP Internet Transaction Server Installation 6.20 | 
| 514958 | WP 2.11: workplac.car and ITS version | 
| 486032 | Login templates for ITS in PAS | 
| 446882 | Web: Performance improvement and browser compatibility | 
| 386744 | Obtaining patch for ActiveX DocWeb.cab | 
| 383549 | Patch strategy Internet Transaction Server | 
| 377854 | BW 2.0B Package patch for ITS 4.6D | 
| 375810 | Installing the ITS for SAP Employee Self-Service | 
| 374589 | MiniALV: Drag and Relate Link does not work | 
| 369004 | WP 2.11: Launchpad not displayed under Win95 (a.o.) | 
| 368159 | WP 2.11: login problems for some domains | 
| 366642 | WP2.11: Drag and Relate links to MiniApps | 
| 366641 | WP 2.11: generic personalization service is missing | 
| 366052 | ITS versioning | 
| 364595 | WP 2.11: password displayed in URL after change | 
| 361064 | |
| 359319 | WP 2.11:Hight/width parm. transf. to MiniAps incrct | 
| 359318 | WP 2.11: Incorrect input field length in Workplace login | 
| 358852 | Error: MiniApp service: WP2.11 personalization | 
| 358837 | WP 2.11: Internet Explorer 4 problems in Launchpad | 
| 356977 | Enhancements for ITS application packages | 
| 354466 | Nvgtng out of Workplace does not delete SSO Cookies | 
| 338477 | WP 2.10: Workplace cookie set too late | 
| 335942 | WP 2.10: BBP only runs in "external mode" in Workplace | 
| 335521 | ITS patch installation of kernel files | 
| 331925 | WP 2.10: MiniApp Refreshing & SAP launchEvent | 
| 330793 | Downloading patches | 
| 330479 | Front office: Default call / selecting service is missing | 
| 327567 | Installing ITS services (APO:3.0 and 3.1) |