When utilizing the script command modify_uc_object and go immediately:
modify_uc_object(&run#,GOIMM,'SAMPLE.JOBS')
It is possible to get a return code not listed in the documentation.
Release : 12.3
Component : AUTOMATION ENGINE
Multiple executions against the same task.
If go immediately is ran against a task that is not in a 'Waiting for Predecessor' status, it is possible to have this code returned. It will be added to the documentation in future versions.