NetBackup: how to restore oracle backup to a different server

Production environment is running on RAC, prod1 and prod2 are the cluster members.
We need to restore the production data to a testing server test1 for application testing, if test1 uses the same NetBackup master and media servers, we can restore the data using this rman code

set dbid = 1234567890;
connect target /
connect catalog rmanid/rmanpass@rmancatalog

RUN {
allocate channel c1 type 'SBT_TAPE' parms 'ENV=(NB_ORA_CLIENT=prod1)' maxopenfiles 10;
allocate channel c2 type 'SBT_TAPE' parms 'ENV=(NB_ORA_CLIENT=prod2)' maxopenfiles 10;
set until time "TO_DATE('2012-03-21 12:30:00', 'YYYY-MM-DD HH24:MI:SS')";
restore controlfile;
sql 'alter database mount';
restore database;
recover database;

release channel c1;

release channel c2;

 }

But if we try the restore directly, we will get this error:
ERROR: client is not validated to perform the requested operation.

Before restoration, we have to allow test1 to restore from the backup made on prod1 and prod2. To do this, you need log on to the backup master server. In directory /usr/openv/netbackup/db/altnames, create a file named test1, in file test1, put prod1 and prod2 as the content.

$ cat /usr/openv/netbackup/db/altnames/test1
prod1
prod2
$