Changes to system variable definitions must match the input options described in the section "Creating a new system variable".
Changes to the type and/or length of a system variable definition may require re-compilation of all file I/O modules and process definitions that reference it. Refer to System Variablesin the Technical Reference Guide for details.
Deletion of a system variable definition should be done with extreme care. Deleting a system variable may cause file I/O modules and/or process definitions that reference it to fail. The failure may be during execution and/or during compilation.