z/OS Security Server RACF System Programmer's Guide
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Disallowing duplicate names for data set profiles

z/OS Security Server RACF System Programmer's Guide
SA23-2287-00

If you do not want your users to define duplicate data set names, turn on bit 1 of byte 0 in module ICHSECOP. (Duplicate data set names mean two discrete profiles have identical names, but reside on different volumes.)

If you choose this option, the RACF® manager fails the ADDSD command and the RACF define macro if you attempt to define for a discrete data set profile a name that already exists.
Note: For RACF classes other than DATASET, you can never have duplicate profile names defined to RACF within the same class.

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