U4012 abend using Perfmon

Document ID : KB000124503
Last Modified Date : 14/01/2019
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Question:
Am running batch reports for PMAM and PMIM, but receiving U4012 error.
How can I resolve this error?
Answer:
The doc indicates ABND4012 
4012 

Reason: 

An attempt to start up the system has failed because the IDMSUXIT module was not found in the load or core-image library. 


IDMSUXIT should reside in your custom loadlib within your batch JCL's STEPLIB. 

I had CDMSLIB DD in the batch jcl which did not include a loadlib that contained IDMSUXIT. 
STEPLIB loadlibs did have IDMSUXIT.

CDMSLIB DD should never be in batch JCL.  Only CV startup JCL
 
Once CDMSLIB DD was removed from the batch JCL the 4012 was resolved