[iPad] Charged for app ordered on iPad even though I have iTunes credit

 

Hi, The other day I bought Documents To Go through iTunes while on my iPad. I have a credit on iTunes but instead of deducting the price of the app from the credit, it charged me the full price of the app. Is there a setting somewhere on the iPad that I should have triggered that would have let the iPad recognize my iTunes credit? When in iTunes on my iPad I do not see the credit on the screen. When I order from my Mac it always recognizes any credit so I know I can order from my Mac and the credit shows on the screen but I'd like to be able to order from my iPad if possible. Thanks. Joyce

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