When a data set with the specified name already exists on the
receiving volume or on any volume if the data set is cataloged and
if you do not specify the REPLACE or NEWNAME parameters, DFSMShsm does
not process the HRECOVER command for that data set.
The data set to be replaced must have the same data set organization
as the data set from which the backup version was created. For example,
a sequential data set can not be recovered into a partitioned data
set member.
If the backup version is being recovered and both the backup version
and the target data set are cataloged, then DFSMShsm will fail the HRECOVER
request when the data set organizations do not match.