Split-mirror backup: Attempt to mount unknown instance

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Hi experts,

I am backing up the Oracle database of an SAP system online via the split-mirror approach with a BRBACKUP -t online_split command. After having copied all datafiles, BRBACKUP terminates with the following error message (excerpt):

BR0330I Starting and mounting database instance X86/SPLIT ...
BR0278E Command output of '/oracle/X86/102_64/bin/sqlplus':

SQL*Plus: Release 10.2.0.1.0 - Production on Fri Aug 1 00:28:15 2008

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

SQL> ERROR:
ORA-12545: Connect failed because target host or object does not exist


SQL> 
SQL> ORA-12545: Connect failed because target host or object does not exist
SQL> 
BR0280I BRBACKUP time stamp: 2008-08-01 00.28.15
BR0279E Return code from '/oracle/X86/102_64/bin/sqlplus': 0
BR0302E SQLPLUS call for database instance X86/SPLIT failed
BR0332E Start and mount of database instance X86/SPLIT failed

At this point,

- all data files have been copied successfully;

- the control files have been copied;

- a copy of the backup summary .fnd file has been written to the sapbackup directory of both database host and backup host;

- I verified that the tablespaces had been put into backup mode before the split command was executed.

I wonder why BRBACKUP is trying to mount an instance "X86/SPLIT" that is not defined in tnsnames.ora?

What is the function of this step, and how can I suppress it as this flags the entry of the backup run in DB12 as failed?

OS version: Solaris 10 x64 (database and backup host)

Database: Oracle 10.2.0.2.0

SAP Kernel: 700

BRTOOLS Version: 7.00 (34)

Best regards,

Rainer