Check the value contained in the file $NH_ORACLE_HOME/EHORAVER.
If $NH_ORACLE_HOME/EHORAVER contains:
Then the Oracle Update kit that was released in March 2015 is required and will be prompted for/applied when updating to 6.3.2.09.
The Fix# for this Oracle Update kit for each OS:
Solaris : RO79854
Windows : RO79855
Linux : RO79856
If $NH_ORACLE_HOME/EHORAVER reads:
You already have the latest Oracle Update kit installed and you will not be prompted to apply during the upgrade.