What does this mean: "Tell us if any of the $ in Box 5 of 's 1098-T includes amounts already reported as income on 's tax return"?

How would I know if any of the amount is included as income? How could that happen? Since it asks, I assume it's possible, but I don't understand how it could happen or how I would know. I guess this refers to my kid's W2/1099MISC which is weird since it's not mine. And if look my kid's docs how would I know if the $ was part of what's on their forms? I'm tempted to answer no, but that's more a guess. It's like many TT questions: surely there's a reason to ask but I don't know why; I don't understand the context. Asking a question always begs the question: why are you asking? or how would I know? TT does not do good enough job anticipating or responding to such natural questions.