You are recieving DFHFC0972 when trying to OPEN or ENABLE a file after defining the file using resource definition online (RDO).
DFHFC0972 Non-RLS OPEN of file filename failed. VSAM catalog entry not found, return code - 8111 X'0020' in module DFHFCFS.
You also noticed the dataset was changing names when viewing the files. The file was defined as physical sequential in the startup JCL.
You have a DD Card in the JCL and that over-rides the RDO definition.
Resolving the problem
Remove the JCL override in the startup up JCL.
CICS/TS CICS TS CICS Transaction Server