If X was a courtesy runner for the catcher several innings ago, it is ok for him to do again. If he ran for the pitcher, or has been in the game and out since he was a courtesy runner, this is not a good thing, since he can not run for the catcher now. There should be no "finding out about this after a pitch" since you are recording subs and courtesy runners and soon as he tries to go in, you say "no can do". Technically, I would consider him in the game, when he takes the runner's place, but practically, as I am writing down the courtesy runner's number I note the error and point it out to coach immediately, so no ejection.
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