upgrading to ora11.2.0.3, on aix.6100-08, missing patches

Hi,

it's my first question to the community, please excuse me if i'm doing something wrong.

I've upgraded from Oracle 10.2.0.4 to 11.2.0.3 on a AIX test box with an operating system version 6.1, TL8 (technical level 8).

The installer warn me that this three patches were missing:IZ97457, IZ88711, IZ89514. Ignoring the warnings, the installation succeeded and the testing went fine, but before upgrading the production environment, I asked the sysops to intall those patches.

They answer that the 8th tecnical level resolved the patched issues, and now the system libraries are  at a higher version than the one delivered with the patches, and that there's no need of any patches, since applying them would be a downgrade of the system level.