Our products are coded in C, COBOL and mainly PL/I and don’t depend on any zOS release level. They are using documented standard interfaces like LE370, DB2, RACF, IWS (TWS)-PIF, TCP/IP, VSAM, BSAM, QSAM, etc.. IBM guarantees compatibility of these subsystems. Hence our programs are working in any zOS environment including z/OS 2.3 and z/OS 2.4 without known problems.
All maintained SmartJCL versions support new z/OS 2.3 JCL enhancements by fix level 2018-04-16.
All maintained SmartJCL versions support new z/OS 2.4 JCL enhancements by fix level 2020-01-03.