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Specifies whether or not the user can override the data set specified in the MACLIB parameter, when a function is run in DLI mode. (When a function is run in BMP mode, irrespective of the setting of this parameter, the user cannot override the data set specified in the MACLIB parameter.)
The user can override the MACLIB parameter.
The user cannot override the MACLIB parameter.
If you specify UMACLIB=N:
  • The IMS™ Macros Data set name field on the DLI Mode Data Sets 1 panel is protected.
  • MACLIB= statements in the HFMIMSIN input of batch jobs are ignored.
  • No MACLIB= statements are included in the JCL generated by ZDT/IMS dialogs.

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).