CREDENTIALS_CASE={A|
D|S]

A.
On z/OS or IBM i, PowerExchange processes and passes user IDs and passwords to the operating system for authentication, as follows:
PowerExchange converts the user ID to uppercase.
PowerExchange checks whether the operating system is configured to handle mixed-case passwords.
If the operating system is configured to handle mixed-case passwords, PowerExchange keeps the password case as is.
If the operating system is not configured to handle mixed-case passwords, PowerExchange converts the password to uppercase. On z/OS, if the password is longer than eight characters, which indicates it is a passphrase, PowerExchange keeps the case in which the password case was entered.
PowerExchange passes the user ID and password to the operating system for authentication.
On Linux, UNIX, or Windows, PowerExchange passes the user ID and password in the case that you supplied them to the operating system for authentication.
D
.
On IBM i or z/OS, PowerExchange converts user IDs and passwords to uppercase and then passes them to the operating system for authentication.
On Linux, UNIX, or Windows, PowerExchange passes the user ID and password in the case that you supplied them to the operating system for authentication.
S.
On IBM i or z/OS, PowerExchange converts the user ID to uppercase and leaves the password in the case that you supplied it. Then, PowerExchange passes the user ID and password to the operating system for authentication.
On Linux, UNIX, or Windows, PowerExchange passes the user ID and password in the case that you supplied them to the operating system for authentication.