Dummy oversteps, director called late
This is similar to the question raised in the post "Preventing declarer playing from the wrong side" but more about restitution. I am called to the table by a less experienced pair (E-W) playing a more experienced pair(N/S). This is the story. South is declarer and plays the Ace from hand. North says "No you are in dummy". The Ace goes back into South's hand and a low card is now led from dummy, East plays low and South plays the 10. East now calls me and asks if he can insist that South plays the Ace. So here is what I say:
1. You (three players not dummy) should have called me when the Ace was played from the wrong hand.
2. The fact that the lead was allowed from dummy and followed by East implies that East/West are not exercising their right to accept the lead of the Ace (though they may not have been aware of that right).
3. So you (E) are too late to insist on the Ace being played now.
4. I know this happens all the time but dummy is only allowed to try to prevent partner leading from the wrong hand, not allowed to point it out after it has happened.
5. I have the power to impose a procedural penalty on N/S at this point (at the end of the hand) but I am not minded to do so this time. But please all be aware of the restrictions on dummy for the future and please call the director right away next time.
Was I right?