Erroneous info

Here's the sitch:

B1 commits a common foul on A1 which is the teams 7th, partner (rookie official) administers the FTs.
A5 rebounds the missed 1st shot & scores a lay-up, nobody else moves. Team B is granted a timeout immediately.
My partner says to me I accidently told them 2 shots.
I remember reading a similar situation in the case book 8.6.1 to be exact. The only difference is my sitch involves a scored basket. I tell him no worries, we can correct it.

What we did was cancel the basket & gave the ball to Team B for a spot throw-in. After re-reading the case book this morning, I noticed that I told the young official wrong because we should've went to the AP arrow.

Is wiping off the basket by A5 correct?

I totally blame myself for:
1. not being cognizant that he said 2 when it was 1 & 1... I could've eliminated the error & my misapplication of the rule would've never occured had I been on my Ps & Qs

2. not knowing the rules (partially proficient doesn't count)

Let me know if everything else we did was correct prior to our failure of going to the AP arrow. I'd like to shoot my partner an email & clear things up for his future reference. Thanks!