Correct Server or Correct Receiver not in correct position

If the correct server or correct receiver is not in their correct position when the score is called, the referee or a player may stop the rally before the return of serve to identify the player /position error and the rally shall be replayed. After the return of serve a player who stops to identify or ask if a player was in the correct position when the score was called will have committed a fault and will lose the rally.

Rule 4.B.10 second paragraph

If the correct server or correct receiver is not in their correct position when the score is called, the referee or a player may stop the rally in progress to identify the player/position error and the rally shall be replayed.

Allowing a player to ask for a replay anytime during the rally permits the player who may notice that a correct server or correct receiver was not in the correct position when the score is called permits that player to wait for an opportune time to stop the rally forcing a replay. For example Team B lobs  poorly to Team A and just prior to Team A putting away the ball , Team B stops play because the referee did not catch the correct server/receiver being in the incorrect position when the score was called. This happened twice in ref training and clearly gave the team stopping play an unfair advantage. Changing the rule so that play must be stopped before the return of serves adds an element of fairness and parallels Rule 4.K.

Team A notices that Team B's correct server was not in the correct position but didn't say anything. . Team B and the referee did not notice. During the rally Team B was preparing to put away a poor shot executed by Team A and Team A stopped play, stated team B's server was not in the correct position, and asked for a replay which by rule had to be granted giving Team A an unfair advantage.