ORACLE - Alert log:Failed to Establish Dependency

Issue - Oracle 11gR2 alert log has follwoing messages:

ALTER DATABASE   MOUNT
NOTE: Loaded library: /opt/oracle/extapi/64/asm/orcl/1/libasm.so
NOTE: Loaded library: System
SUCCESS: diskgroup DG_HMWPRD01_01 was mounted
ERROR: failed to establish dependency between database NP_HMWPRD01 and diskgroup resource ora.DG_HMWPRD01_01.dg
ARCH: STARTING ARCH PROCESSES
Fri Jul 19 09:58:38 2013
ARC0 started with pid=26, OS id=11260
ARC0: Archival started
ARCH: STARTING ARCH PROCESSES COMPLETE
ARC0: STARTING ARCH PROCESSES

Solution:
This error is harmless.
Documented in Bug 8304720
Ignore it or srvctl modify database -d <db_unique_name> -a "<diskgroup_list>"
Ref Doc ID - 1474954.1