Installing CA Opera and having a problem with DDEFS not being found. What DDEFs are required?

Document ID : KB000014041
Last Modified Date : 14/02/2018
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Question:

Performing a CA Opera install and do not have IMS, however, am seeing DDEF errors. How do I resolve this?

Environment:
z/OS
Answer:

DDDEF entries for IMS, HSSR, and CICS external libraries must be specified even if not available. If a specific DDDEF environment does not exist,    
define a NULLFILE PDS and use it for the DDDEF specification.       

This basically dummies out the actual work but allows a default allocation to pas a RC0.