Solution : https://service.sap.com/sap/support/notes/633410 (SAP Service marketplace login required)
Key words : 
prerequisites incorrect conversion solution 1, press change button, symptom activity, terms activity, gmt reason, transaction /nse37, enter 'crm_hh_activities_select_map', comment lines, function module, 233 till 256
Related Notes : 
       
| 677456 | SAPKU40003: Support Package 03 for CRM 4.0 | 
| 651069 | SAPKU40002: Support Package 02 for CRM 4.0 | 
| 625550 | |
| 625309 |