A gabbai called someone up for an Aliya. Yaamod, Reuven ben Shimon Shlishi.
Then, it turns out that Reuven isn't Jewish (he thought he was, his mother had a reform conversion and he thought that was enough). Now what?
- If he was caught right away, do you have to re-read it, calling up another as Shlishi?
- Do you have to go back if caught later?
- If not, do you still have to break up the next aliya into two to have a full seven Aliyas?