Passwords convert UPPER case after setting SEC_CASE_SENSITIVE_LOGON=TRUE

Hi,
In order to set the database passwords in case sensitive in our environment R12.1.3 ( DB 11.2.3), we have followed note:
 "Database Initialization Parameters for Oracle E-Business Suite Release 12 (Doc ID 396009.1)"

#########<br/> # <br/> # Database Password Case Sensitivity<br/> # <br/> # The default for Oracle E-Business Suite databases is FALSE i.e. passwords are case-insensitive<br/> # <br/> # Oracle E-Business Suite now supports Oracle Database 11g case-sensitive database passwords<br/> # This feature is available on E-Business Suite Rel 12.1.1 or higher<br/> # To enable this feature apply patch 12964564 and set SEC_CASE_SENSITIVE_LOGON to TRUE<br/> #<br/> ##########"

So, we shutdown application services and applied the patch