Will it looks like their was a bug in the ASA codeset.
I was looking at upgrading my testing ASA5505 a week ago, and finally sat aside some time this morning and upgraded my unit, since the memorial weekend is over & I had some free time on my hands.
and now our ASA show inventory commands;
As with most code, it's only as good as your QA group.
Almost nothing is 100% perfect, and all code has some type of bugs or hidden problem(s). If your in doubt to the above statement, than login into the cisco software download pages and read the release notes. And than look at all of the bugs & caveats that are posted for that version of software release.
You got to love software development, and developers :)
Freelance Network/Security Engineer
kfelix @ hyperfeed .. com