I recently added my son to our "iTunes family"; I have set his Apple ID up as a child account and have checked the "Ask to Buy: require approval from parent for all purchases ..." checkbox.
Yet today I received an app store invoice for an in-app purchase my son made in one of the games he plays. Do in-app purchases not fall under the "require approval from parent" rule?
(I know that I can prevent in-app purchases by configuring "Restrictions" on his iPad, but that is not the point)