CBR3502I Command rejected, a request for a volume or drive in library library-name is in use by another process.
Explanation
A volume or drive in library library-name is being exclusively used by another process at the time another request is received by the library controller.
System action
The I/O operation is stopped.
Operator response
Notify the system programmer.
System programmer response
OAM should not be sending more than one request to a volume or drive at any time. 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