Solution : https://service.sap.com/sap/support/notes/674430 (SAP Service marketplace login required)
Key words : 
j2ee secure store30 aug 04  1   log mirroring recommendations23 apr 04  3   java, 1 general2 pre-installation3 installation4 post-installation=================================================================1 general01 aug 10, schema user password - alphanumeric chars only11 mar 04  3   abap, application group -> additional components -> maxdb30 aug 04 java, schema user password - alphanumeric chars onlyproblem, =================================================================2 pre- installation=================================================================3 installation23 apr 04 java, date  section  description--------------------------01 aug 10  1   installation, symptom                                                                        sap web application server 6, replaces existing installation master dvds, current release30 aug 04  4   java
Related Notes : 
       
| 965037 | 6.20/6.40 Patch Collection Installation: SAP MaxDB / Win | 
| 765260 | Unicode characters are dealt with incorrectly | 
| 723288 | Central Installation Note SAP Web AS 6.40 SR1 | 
| 675938 | SAP Web AS 6.40 ABAP Installation on Windows | 
| 669963 | Log mirroring: DUAL/Mirrored vs. Hard/software raid | 
| 382312 | CCMS for SAP systems with SAP MaxDB >= 7.2 (7.2,..., 7.9) |