After you have installed a SYSMOD in the target libraries, you should test it to make sure the change works correctly. If during testing you find an error in one of the SYSMODs you applied, you can use the RESTORE command to remove that SYSMOD from the system.

The RESTORE command causes the elements in the distribution libraries to be reinstalled on the target libraries. Therefore, when restoring a SYSMOD, you may have to restore more than the one SYSMOD in error. All SYSMODs that have not been accepted and that affect some of the same elements or need the same service level requisites as the one you are restoring must also be restored.