They've changed the system so now it tells you outright when a book can't have a code applied. You do have to click the "I've got a code/gift card I want to use button" to get to it, but it's a distinct red-outlined warning with no box to enter the code.
If for some reason coupon discounts aren't going through on the final price after the customer's clicked all the "apply this code" buttons and checked the proposed total to make sure it got subtracted, then that's definitely a problem which needs to be addressed.
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