If the job is multi-threaded, do one of the following

Specifies the action to take when you call the trigger program is called in a multithreaded job. You can choose from:

Let system value QMLTTHDACN determine whether to run the trigger program

Run the trigger program

Run the trigger program and send a diagnostic message

Do not run the trigger program

Although there is no direct relationship between the threadsafe and the multi-thread attribute of the trigger program, there is a suggested multi-thread action. 

If the threadsafe value is no, multi-threaded job should be set to Do not run the trigger program.

If the threadsafe value is unknown, multi-threaded job should be set to Let system value QMLTTHDACN determine whether to run the trigger program.

If the threadsafe value is yes, multi-threaded job should be set to Run the trigger program.

You can override the suggested value by selecting a different multi-threaded job action after selecting the threadsafe value.