UNKNOWN AUTHID field (DEFLTID subsystem parameter)

The DEFLTID subsystem parameter specifies the authorization ID that is to be used if RACF® is not available for batch access and USER= is not specified in the JOB statement.

Acceptable values: 1–8 characters, the first of which must be an alphabetic character
Default: IBMUSER
Update: option 39 on panel DSNTIPB
DSNZPxxx: DSN6SPRM DEFLTID