BOO or Ineligible Player

[jmkupka]

PONY rules (didn't happen during Nationals )

As BU, I watched from behind 1B as my partner resolved this:

Clueless OC thinks DP doesn't bat, but thinks Flex does.

Inattentive Defensive bookkeeper doesn't catch it 'til 2nd time around.

B8, DP, is scheduled to bat.
B9 bats instead. Singles.
Flex comes to bat.
Before 1st pitch, DC calls time. Appeals BOO.
B8 ruled out, then after discussion, enlightened OC decides it would be prudent to put B1 in to bat instead of Flex.

Got me thinking, though... the 1st time around, when it wasn't caught, the Flex was absolutely an ineligible player when she batted instead of B1. Is this handled the same as other ineligibles, where even if it's discovered innings later, the rule is enforced and the player is now restricted to the bench?