Is it a problem when an iAd may be obscured?

Question

I added the ADBannerView to a view and when I load the app I get the following message:

ADBannerView: WARNING A banner view (0x7a023c0) has an ad but may be obscured. Th

Answer 1

I am obtaining this message when I add a ADBannerView to a UIScrollView. In this case the ad may be obscured.