If you do not code a DEST parameter, JES directs the sysout data set to the default destination for the input device from which the job was submitted.

In a JES3 system, if you do not code a DEST parameter, the default destination is the submitting location. For jobs submitted through TSO/E and routed to NJE for execution, the default is the node from which the job was submitted, and the destination ANYLOCAL.

If a specified destination is invalid, the job fails.

If you've coded the ORG parameter but did not explicitly code a primary destination, the default primary destination is the node specified in the ORG parameter, not the submitting node.