Solution : https://service.sap.com/sap/support/notes/544274 (SAP Service marketplace login required)
Key words : 
db2 user exit executable back, db2 user exit executable, db2 command line processor, platform/sap release combination, 64-bit db2 control center, 32-bit db2 control center, 32-bit/64-bit clients supported, db2 udb v7 64-bit, system displays error message, db2 version 7 control center
Related Notes : 
       
| 637842 | DB6: 64-bit DB2 database server with R/3 3.1I, 4.0B, 4.5B | 
| 500990 | DB6: SQL1707N during migration to 64-bit | 
| 490247 | DB6: Migrating from AIX 4.3.3 to AIX 5 with DB2 Version 7 | 
| 481697 | Local DB Dir migration for DB <SID> failed | 
| 442173 | |
| 356828 | DB6: Migrating to 64-bit for AIX, Linux x86_64, and Solaris |