IDC2648I JOB CONTROL CARDS FOR EXTERNAL SORT MISSING OR IN ERROR

Explanation
If this message occurs by itself, the caller specified
the EXTERNALSORT parameter, but did not provide the proper job control
for the sort work files.
If this message is preceded by IDC2649I
or IDC2650I, BLDINDEX was not able to complete an internal sort. 
Proper job control for the external sort work files was not supplied.
 The alternate index being built is named in a subsequent message.

System action
The system ends processing for this alternate
index. However, BLDINDEX attempts to process any other alternate indices
specified by the OUTFILE or OUTDATASET parameter.

System programmer response
If the error recurs and the program
is not in error, 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 SYSOUT
output for the job.

Programmer response
Correct the external sort work file job
control.  Submit the job again. Alternatively, provide enough virtual
storage so that an internal sort can be performed.

Source
DFSMSdfp

Module
IDCBI01