OOTP Baseball Manual - Pitching Game Log
I think the below should state one batter faced (or an AB resolved, something like that) instead of an inning pitched. Wouldn't a game log entry exist where a pitcher came in an just walked one batter and was taken out?
From manual:
This page displays statistics for every game in the current season in which the player had at least one inning pitched. This information is provided both for position players and pitchers.