Take a look at this:

prompt:SD 27
 LDEV     AVAIL         OWNERSHIP         VOLID         DEN   ASSOCIATION

   27   A UNAVAIL       #S3426: 1 FILES
promt:SD 43
 LDEV     AVAIL         OWNERSHIP         VOLID         DEN   ASSOCIATION

   43   A UNAVAIL       #S3426: 1 FILES
prompt:SD 58
 LDEV     AVAIL         OWNERSHIP         VOLID         DEN   ASSOCIATION

   58   A UNAVAIL       #S3426: 1 FILES

As you can see we have 3 different ldevs with the same session number. How can
this happen?