A tile is discarded and misnamed, and two players call for mah jongg
Penalty for a Misnamed Discard (Article ID 67)
If a tile is discarded and misnamed and someone points it out, the discarder must rename the tile correctly.
Misnamed Discard and the Correct Tile is in the Player’s Hand (Article ID 80)
A player discards a tile and misnames but then realizes he/she has the same tile in her rack.