15.1 If a player serves or receives out of his turn, play shall be interrupted and shall continue with that player serving or receiving who should be server or receiver respectively at the score that has been reached according to the sequence established at the beginning of the match, and in doubles, to the order or serving chosen by the pair having the right to serve first in the game in which the error is discovered.

15.2 If by mistake the players have not changed ends when ends should have been changed, play shall be interrupted as soon as the error is discovered and the players shall change ends.

15.3 In any circumstances, all points scored before the discovery of an error shall be reckoned.