Solution : https://service.sap.com/sap/support/notes/686129 (SAP Service marketplace login required)
Key words : 
contact person change object type          accountcrm rule id              lead_chp_cp user group           sap_crm_part_man_cc action group id      act_grp_change valid, customer relationship management->basic funtions->access control engine ->rights->ace, 'ace administration tool' node, correspond-ing node dcoumentation, description    partner man cc, partner manager channel commerce, id        chp_contactpers_pmcc, terms channel management, ace rights customizing, symptom channel partner
Related Notes : 
       
| 696262 | CRM 4.0 SP Stack 1/2004 (SAPKU40004): Release & Info. Note |