OPEN OUTPUT, no DD in the JCL. DISPLAY file-status showed 35, job RC 0.
Added a WRITE after the DISPLAY. Same OPEN, now DISPLAY shows 96 and we S0C4 on the WRITE.
Why did the status on OPEN change just because I added a WRITE later?
35 = file not present. 96 = no DD statement (VSAM/QSAM flavor depending on shop options / CBLQDA).
COBOL does not stop after a bad OPEN. Your DISPLAY is not a checkpoint of "what OPEN returned forever." By the time you WRITE with no DD, things are already sideways and status can look different.
Check status after OPEN and ABEND yourself on anything not 00/97. Add the missing DD.
Also look up CBLQDA for your runtime. It changes how missing DDs behave on QSAM.
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