Pitching eligibility

[Rackster]

In Little League,when is a pitcher officially charged with an inning pitched? Is it when he throws his first warm-up pitch,when he is announced,or when he throws his first pitch to a batter? Under Official Regulations,section VI Pitchers,note 1 states "The withdrawal of an ineligible pitcher,after that pitcher is announced,or after a warm-up pitch is delivered,but before that player has pitched a pitch to a batter,shall not be considered a violation.Little League officials are urged to take precautions to prevent protests.When a protest situation is imminent,the potential offender should be notified immediately." Does this also mean if eligible pitcher B throws a few warm-ups,then then his coach decides not to change pitchers and sticks with pitcher A,pitcher B is charged with an inning pitched or am I just reading into the rule too much? Does anyone have a good way to keep track of pitchers innings worked or is it just an honor system type of thing? Thanks for any help you can give me!!