IEA248I   NUCLEUS MODULE modname IS LISTED IN IEANxdd1 AND IEANxdd2

Explanation

The system detected a duplicate module entry appearing in two nucleus module lists (NML). This may represent an error in a non-MVS product. In the message text:
modname
The duplicated module name
IEANxdd1
The first nucleus module list
IEANxdd2
The second nucleus module list

System action

System initialization continues. The system loads module modname as part of the system nucleus.

Operator response

Notify the system programmer.

System programmer response

Make sure that the correct version of module modname resides in the SYS1.NUCLEUS data set. Delete the module name from one of the NMLs listed in the message. Do not delete the name from both NMLs unless this module should not be loaded as part of the system nucleus.

Source

Initial program load (IPL)

Routing code

Descriptor code