Designated Throw-in spot.

Question cam up in Jr High game last night, ball goes out of bounds near the corner and the ball is given to the offensive team. The ball went out on the sideline near the cornerand we administered the throw-in down very close to the corner. My question is, Is this the correct spot for the throw-in?

Reason I am questioning this is that the coach had gone to a rules interpretation meeting and thought they said that in this situation the throw-in spot should be Free throw line extended.

Thanks.