CREDENTIALS_CASE={A|
D|S]

A.
On z/OS or i5/OS, 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 so, PowerExchange passes the user ID in uppercase and the password in the case that you supplied it to the operating system for authentication.
If not, PowerExchange converts the password to uppercase and 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 i5/OS 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 i5/OS 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.