Will downloading Lion from the App Store (previously purchased) while on Mountain Lion erase my current OS?

All,
I'm trying to download Lion from the App Store to make a bootable external hard drive. My concern is that the app store gives me a warning: "OS X 10.8 is already installed on this computer. Are you sure you want to download OS X 10.7?"
I'm not sure what this means and I would prefer not to risk erasing my current operating system. Does anyone have an idea?
Thank you in advance.

Futhermore, I can't believe that the App Store allows you to download OS X Lion while you are in OS X Mountain Lion, because normally the App Store gives an error because you are running a newer Mac OS X.
If you just download OS X Lion, you won't lose OS X Mountain Lion, because just the installer will be downloaded onto the Applications folder. When the download finishes, the installer will show up, so close it, and use Lion Diskmaker to create an external drive with OS X Lion > http://liondiskmaker.com
As you are running OS X Mountain Lion, I recommend you to make an external drive with OS X Mountain Lion instead, if you can. That's because probably you will want to reinstall OS X Mountain Lion and not Lion

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"was just used to download Podcasts from the App Store"
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Will downloading Lion from the App Store (previously purchased) while on Mountain Lion erase my current OS?

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