2.14 OUT OF ORDER OF SERVING, RECEIVING OR ENDS
2.14.1 If a player serves or receives out of turn, play shall be interrupted by the
umpire as soon as the error is discovered and shall resume with those players
serving and receiving who should be server and 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 of serving chosen by the
pair having the right to serve first in the game during which the error is
discovered.
2.14.2 If the players have not changed ends when they should have done so, play
shall be interrupted by the umpire as soon as the error is discovered and shall
resume with the players at the ends at which they should be at the score that
has been reached, according to the sequence established at the beginning of
the match.
2.14.3 In any circumstances, all points scored before the discovery of an error shall
be reckoned.