Solution : https://service.sap.com/sap/support/notes/707593 (SAP Service marketplace login required)
Key words : 
dropdown list box, attached correction instructions, chat view set, 'activate class cl_crm_ic_chatinteraction_impl, redefine method do_prepare_output, class cl_crm_ic_chatinteraction_impl, 'method do_prepare_output, chat solution, instance method, interaction history
Related Notes : 
       
| 709921 | CRM 4.0 SP Stack 4/2004 (SAPKU40005): Release & Info. Note | 
| 705627 | CRM4.0 SP06 Termination of application during status change |