As documented in our Release Notes, starting with Version 12, the PSO (Process Sysout) interface has been retired.
As a result there is no need to run BQ4JJES and it has been removed from CBQ4JCL.
The intention to retire the PSO interface was announced on RI21689 in 2010.
The SAPI interface replaces PSO for post JES Spool Sysout transfers, if required.
More information about this subject can be found with Knowledge Document TEC1416777