While OS PL/I applications that use PLISRTx are supported by Language Environment for OS/390 & VM Release 1.4 and later, we recommend that you relink your applications that use PLISRTx. See Differences in PLISRTx Support for the reasons. The recommended relinking can be done either with Language Environment or with PN69803 on OS PL/I Version 2 Release 3. Either method gives your load module the benefits of exploiting the Language Environment DFSORT interface support.