If a DD statement requests unit affinity in a UNIT=AFF parameter or volume affinity in a VOLUME=REF parameter with an earlier DD statement, do not code FREE=CLOSE on the earlier statement.

If you code FREE=CLOSE on a sysout DD statement that references an OUTPUT JCL statement containing a GROUPID parameter, JES2 will not group the data sets into one output group. Instead, JES2 produces one copy of the sysout data set for each OUTPUT JCL statement that the DD statement references.