Solution : https://service.sap.com/sap/support/notes/701226 (SAP Service marketplace login required)
Key words : 
entryset sdm_java_home=/qibm/proddata/java400/jdk14toset sdm_java_home=%java_home%, driverlocation=/usr/sap/<sid>/sys/jdbc/ntv/db2_classes, driverlocation=/usr/sap/<sid>/sys/jdbc/tbx/jt400, sap j2ee engine config tool alsofor native jdbc driver installations, sap system installation                      sep/20045 final installation steps                        nov/20086 troubleshooting                                  oct/2005+===================================================================+ 1, jun/05>--------------------------installing additional double byte language localesthe 6, /usr/sap/<sid>/sys/jdbc/tbx/jt400, /usr/sap/<sid>/sys/jdbc/ntv/db2_classes, documentation 'installation guide - sap web applicationserver java 6, installation guide sap web application server java 6
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