Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Compiler and Runtime Migration Guide


Base addressability considerations for OS/VS COBOL programs

With OS/VS COBOL, you must maintain addressability to storage areas not contained within the WORKING-STORAGE SECTION of the COBOL CICS program. To satisfy program requests, an OS/VS COBOL program must keep track of storage area addresses allocated by CICS to manipulate Base locator for LINKAGE-SECTION (BLL) cells within the application program.

In Enterprise COBOL, and the associated support within CICS, this manipulation is no longer necessary. Therefore, when you upgrade from OS/VS COBOL to Enterprise COBOL, you must convert such programs. (If the COBOL CICS program does not manipulate its BLL cells addressing, conversion is not necessary.)

Note: You can do this automatically using the CCCA, as explained in Conversion tools for source programs.
The three areas that require change for programs that manipulate BLL cells are:

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