Two data sets cannot be opened concurrently on the same tape volume because the tape can be positioned only within one data set at a time.
The severity is 8.
The operation is ended and the next control statement is sought.
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 all printed output and output data sets related to the problem.
Copy the input data set to a temporary data set on another volume, then recopy the temporary data set back to the desired volume.
Data Facility Product (DFP)
Note 11
-