OBR Batting out turn???

[eureka25]

Here's the sitch:

OBR rules/house league/playoff game/continuous batting order for 13/14. Both teams turn in their lineups - Team A has 10 while Team B has 9. Team B is home team.

Team B acquires the 10th player sometime in the first inning and drops them at the bottom of the order and doesn't inform the umpire or Team A. B10 bats in the second inning - noone notices a problem. The game goes on... Fourth inning comes around and B10 bats again - noone notices anything. The game goes on... Fifth inning comes around and B10 gets a hit to tie the score. Now there is a problem!!!!

Team A manager comes out to tell the umpire that this was an illegal player/batting out of turn situation and should rule them out.

There are obviously a whole lot of questions that need to be addressed here as it refers to ethics/stupidity/rules/... But I will just leave at this and let me here some rulings and how you would handle the sitch.

FYI - I am avid reader/student from the site. I have been a patched umpire for softball for 4 years but now just do managing/administering Little League for our hometown. (Please don't hold that against me)

Thanks,
Jeff