RACF® commands were originally TSO commands. (TSO, or Time Sharing Option, is the means by which interactive users gain access to MVS™ systems.) The RACF commands are treated as TSO commands.

TSO messages (which have a prefix of IKJ) can result from syntax errors made while issuing a RACF command.

For more information on TSO IJK messages, see z/OS TSO/E Messages.