Version 1 of AFP2283 was in your local cache when you checked in 31-228T1212-052. If you checkout 31-228T1212-052, then get the latest version of AFP2283, then check 31-228T1212-052 back in, you'll be golden.
Jeff is right of course, but I would also point out that it is often not a problem if it shows the older version in the Contains tab. You shouldn't really need to fix that (by checking in the parent again) - if people are trained in how to use the system. I mean you can, but this could come up a lot, and it would be a pain to try to fix all cases. Also consider that you can set some users to Always Work With Latest Version (Settings>>Reference Dialog).
If you Clear Cache or Get Latest Version, you will get the newer AFP2283 file. I guess as a PDF (as opposed to SolidWorks) the signals are not as clear that it is out of date...