[jcref]

I need some help with understanding the answer to a Refresher Exam answer.

A-1 is fouled. The scorer informs the official that it is the 10th foul on team B. the first free throw is unsuccessful. The second free throw is successful. When B-1 has the ball for the throw in, the scorer informs the official that team B has only commited 9 team fouls. The Official cancels the last free throw and resumes play with the AP procedure. Is the official correct?
The Answer key says ( NO ).

This same play is used in the 2008-2009 case book page 11. 2.10.1 situation D. If I use this situation on the above play, I would say the official is correct, therefore my answer would be (yes).
What am I not understanding about this play, any help would be great.