CBR3516I Command rejected, the number of open files has exceeded the allowed limits.

Explanation
 Only 128 open files are allowed against a volume
at any one time. The device controller has determined that the number
of open files has exceeded the number of open files allowed.

System action
 The I/O operation is stopped.

Operator response
 Notify the service representative.

System programmer response
 If the problem recurs and if the
program is not in error, search problem reporting databases for a
fix for the problem. If no fix exists, contact the IBM® Support Center. If the sense data displayed
in the previous CBR3300I message does not equal zero then obtain the
SYS1.LOGREC error record.

Source
 Object Access Method (OAM)

Routing Code
 2,4,6

Descriptor Code
 4