Solution : https://service.sap.com/sap/support/notes/621071 (SAP Service marketplace login required)
Key words : 
upgradei/    important general remarks------------------------< d027190 november 09, /    important general remarksii/   errors, cd-romiv/   actions, individual phasesvii/  actions, sap service marketplace, upgrade documentationiii/  errors, ebp/crm release 4, iseries-specific problems, sap note refers, general notes 604728
Related Notes : 
       
| 737800 | Enhancements to upgrade on SAP CRM 4.0 SR1 | 
| 604728 | SAP CRM 4.0: Information on Upgrade | 
| 500297 | Additional Information: Upgrade to SAP Web AS 6.20: iSeries |