Solution : https://service.sap.com/sap/support/notes/738497 (SAP Service marketplace login required)
Key words : 
solution import jco version 2, 1----> binary patches------> sap jco 2, sap service marketplace, jco version 2, jco connection, --> sap crm 3, /3 backend system, system displays, error message, installed languages
Related Notes : 
       
| 755934 | CRM 3.1 SP Stack 07/2004 (SAPKU31009): Release & Info. Note | 
| 747299 | EBP/CRM 3.0 SP Stack 06/2004 (SAPKU30019): Release&Info.Note |