Using family sharing, can a child account do in-app purchases without approval? 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)
In app purchases do fall under the same rule, however if your Apple ID is signed into, say a family computer, he could approve it himself on that device.