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Specifies whether or not the user can override the data set specified in the ACBLIB parameter.
The user can override the ACBLIB parameter.
The user cannot override the ACBLIB parameter.

If you specify UACBLIB=N, the ACBLIB Data set name field on the DLI Mode Data Set 2 panel is protected.

This parameter is optional. If it is not specified on the HFM1POPI macro statement, ZDT/IMS uses either the value specified on the HFM1POPD macro statement (if specified on that statement), or Y (otherwise).