UDBDLIB

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            .-Y-.   
>>-UDBDLIB=-+-N-+----------------------------------------------><

UDBDLIB
Specifies whether or not the user can override the data sets specified in the DBDLIBn parameters.
Y
The user can override the DBDLIBn data set parameters.
N
The user cannot override the DBDLIBn data set parameters.

If you specify UDBDLIB=N then:

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).