The INGMSGSA Automation Table

SA z/OS provides an automation table, called INGMSGSA, that contains all the statements that are required for SA z/OS to work properly.

You must not modify the INGMSGSA automation table. If you need your own automation for messages that are processed in INGMSGSA, you can achieve that by using a separate AT that runs parallel with INGMSGSA. SA z/OS does not stop any message in INGMSGSA and prevent its processing in other ATs.

INGMSGSA is loaded unconditionally as the first AT ahead of any other ATs that you declare in the customization dialog. It must not be specified in the customization dialog.