Education

We used 1 kid's 529 to pay for both kids' qualified expenses after older kid's 529 was exhausted. Therefore, we only received 1 1099-Q, so I think that's preventing the R&B box from appearing. How do I get R&B to appear for the older kid, OR does it matter and instead can I just enter those expenses in one of the books & materials? And if so, which one, required or not required?