Why doesn't the Windows Component installer want all files to be from SP2?

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Gurus,

If I install Windows components on my Windows Server 2003 SP2 computer, I
first get prompted for the location of the Windows Server 2003 SP2 CD-ROM
and I point the installer to the C:\Windows\ServicePackFiles directory.
Then I et prompted for the location of the original Windows Server 2003
CD-ROM, which means I have to point it to the CD-ROM drive, which only
contains the Windows Server 2003 CD-ROM (with SP1) media. Then the
installer is happy and finishes it's job.

My question is, why does the installer ask to pull files from the SP2 CD-ROM
directory only to later ask for files from the SP1 CD-ROM? Why wouldn't it
want all files to be from the SP2?

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