Submitting an iphone-only app to app store? [closed]
In XCode Target -> General -> Deployment Info -> Devices should be set to iPhone.
If your app is only supposed to support iPhone/iPod, only upload iPhone screenshots, don't upload iPad screenshots. Same works the other way around. The only time you should upload both is if your app is universal.
It is not mandatory for apps to be Universal, nor is required to submit both iPhone and iPad screenshots, you can just submit your 3,5" and 4,0" iPhone screenshots.
If it's complaining because iPad screenshots are missing, you might want to check in XCode that your project isn't configured as Universal.