IEB1072W

Explanation
There is a conflict in the JCL or between the JCL
and the catalog entry for the data set.
The unit allocated to
the data set is a tape drive. Therefore the data set must be an unload
(sequential) data set. However, the JCL contains DSORG=PO and/or a
SPACE parameter which specifies directory blocks which indicates that
the data set is partitioned.
Parameters like DSORG=PO can be
added to your JCL even though you did not code them.  SMS ACS routines,
Data Classes, the JCL SPACE, LIKE and DCB parameters can all implicitly
add to JCL.
Message inserts and meanings: ddname
DD name identifying the data set.
dev_type
device type from the UCBDEVT field.
jcl_org
value of the DSORG field in the JCL.
dir_blocks
number of directory blocks specified in the JCL.

The severity is 0.

System action
The data set is treated as an unload data set.

User response
Determine where the DSORG=PO is coming from. Look
for directory blocks in the space parameter, look at the label of
data sets referenced by the LIKE or DCB parameter, and use ISMF to
look at the definition of any Data Class assigned to the data set.
Add
DSORG=PS to the DD statement or the TSO ALLOCATE or ATTRIB command
to explicitly override the DSORG.

Source
DFSMSdfp