Backup Srvrname

I am fighting with my 'Backup SrvrName':

dsm.sys on machine A and machine B are exactly the same, except for
  TCPServeraddress, TCPPort and NODENAME:

DEFAULTSERVER           N215_S

SERVERNAME              N215_S
   COMMmethod           TCPip
....
SERVERNAME              ADM_SERVER
   COMMmethod           TCPip
....

dsmc q opt in machine A:

ADSTAR Distributed Storage Manager
Command Line Backup Client Interface - Version 2, Release 1, Level 0.8
(C) Copyright IBM Corporation, 1990, 1997, All Rights Reserved.

   MachineName:      'ADM_HATOR'
   Default SrvrName: 'N215_S'
   Migrate SrvrName: 'N215_S'
   Backup SrvrName:  'ADM_SERVER'

and dsmc q opt on machine B:

ADSTAR Distributed Storage Manager
Command Line Backup Client Interface - Version 2, Release 1, Level 0.6G
(C) Copyright IBM Corporation, 1990, 1996, All Rights Reserved.


   MachineName:      'BASTET_CLIENT'
   Default SrvrName: 'N215_S'
   Migrate SrvrName: 'N215_S'
   Backup SrvrName:  'N215_S'

So my question is: why is the Backup SrvrName on machine A not the same
  as the Backup SrvrName on machine B?

Henk ten Have (confused)