Although documented that VS COBOL II programs must be compiled with the RENT option to run on CICS, VS COBOL II Release 3.0 and later did not enforce this requirement. VS COBOL II APAR PN65736 added the function to diagnose attempts to run VS COBOL II NORENT programs on CICS (for VS COBOL II Release 3.0 and later).
Language Environment issues message IGZ0018S when it detects a VS COBOL II program that was compiled with NORENT running on CICS. If you are developing on VS COBOL II without PN65736 applied, Language Environment will terminate your VS COBOL II applications run on CICS if they were compiled with NORENT.