I agree with musicnancy that this error doesn't make sense, which is why I defined it as a bug. (I wasn't sure how to put that person's name in my reply, got an error that the html was invalid when I copied & pasted.)
For an expert, please review below my thoughts regarding a possible solution to how the program logic should deal with this situation:
Determine whether itemizing or standard deduction.
(1) If itemizing, the program should NOT enter anything and therefore no message.
(2) If standard deduction then determine whether single or married
(a) If single, populate 300
(b) If married, populate 600
(c) During review, provide the warning and include this note (from 1040 instructions): "The contributions must be made to organizations that are religious, charitable, educational, scientific, or literary in purpose. See Pub. 526 for more information on the types of organizations that qualify."
