091

Explanation
The error occurred during processing of a basic
telecommunications access method (BTAM) OPEN macro. An OPEN routine
found an incorrect or unsupported type of transmission control unit
specified in the unit control block (UCB) for the device allocated
to the data control block (DCB) being opened.

System programmer response
If the error recurs and the program
is not in error, look at the messages in the job log for more information.
Search problem reporting data bases for a fix for the problem. If
no fix exists, contact the IBM® Support
Center. Provide the JCL and the program listing for the job.

Programmer response
Check for improper specification of the
IODEVICE macro used in generating the system. Also, check for program
errors that could have improperly modified control information.  After
correcting the error, run the job step again.

Source
Teleprocessing