In MVS/ESA SP Version 4 Release 1, you can set the REQAPPC variable on or off. You can set the REQAPPC variable by entering REQAPPC ON or REQAPPC OFF from the command line of any APPC/MVS administration panel.

When REQAPPC is set on, the APPC/MVS administration panel will not allow you to add, modify, or copy ASCH transaction program profiles. APPC/MVS needs to be present to successfully process ASCH transaction program profiles.

When REQAPPC is set off, the administrator can add, modify, or copy ASCH transaction program profiles. If you add, modify, or copy ASCH transaction program profiles, the JCL syntax is not checked. Because JCL syntax is not checked, set the Activation Status to inactive when you are adding, modifying, or copying ASCH transaction program profiles. When you migrate to MVS/ESA SP Version 4 Release 2, you can set the Activation Status to active and JCL syntax checking will occur.

In MVS/ESA SP Version 4 Release 2 or later, the REQAPPC command will have no effect on adding, modifying, or copying transaction program profiles. The transaction program profile JCL syntax checking will always occur.