Solution : https://service.sap.com/sap/support/notes/611507 (SAP Service marketplace login required)
Key words : 
importing hp sapkh46c44, source code correction, change activity elements, activity element, personnel number, filled externally, bapi module, terms bapi_bus2002_actelem_create_m, pernr reason, program error
Related Notes : 
       
| 634869 | SAPKU40001: Support Package 01 for CRM 4.0 | 
| 607000 | Required notes for PS-BAPIs |