OS/VS COBOL, COBOL II, Enterprise COBOL for z/OS. OpenCOBOL and OOCobol.
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It would be wise to recompile all programs using the copybook since otherwise there may be duplicate variable names that you're not aware of and that could cause issues later on. Is it necessary to recompile every program using the copybook? No, it is not -- only those programs using the new 88 level have to be recompiled.