DSNE120E data-set-name NOT SEQUENTIAL DATA SET

Explanation
 The user tried to allocate a partitioned data
set when a sequential data set was required.

System action
 The TSO attachment facility is ready for more
input.

User response
 Check the data-set-name. The data set you specified
is partitioned, but you did not specify a member name. Add a member
name, and resubmit the job.