It is right for the referee to cancel the first free throw, but it is wrong to directly judge the opponent's foul ball, which is a correctable mistake. According to Rule 44, before the correctable prescription expires, you can still appeal to the referee together with the captain of your team to correct this mistake. If the referee refuses to admit his mistake, according to the "C- protest procedure" clause of the rules, after the game, before the referee signs the record sheet, your team captain can sign the "team captain protest signature column" on the record sheet to protest against this incident!
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2004 FIBA Basketball Rules:
43.2.3 Free throw players:
It should be behind the free throw line and occupy a position in the semicircle.
You can make a free throw in any way. The ball enters the basket from above or touches the basket.
When the referee puts the ball at his disposal, he should release the ball within 5 seconds.
You should not touch the free throw line or enter the penalty area before the ball enters the basket or touches the edge of the basket.
You shouldn't fake a free throw.
It is illegal to violate Article 42.2.3, 43.2.4, 43.2.5 or 43.2.6.
43.3 Punishment
43.3. 1 If the penalty shooter fouls:
If you hit the basket, you shouldn't score.
Before, at about the same time or after the foul of the free throw player, any other player's foul will be ignored.
The ball should be awarded to the opposing team and thrown into the extension line of the free throw line, unless a free throw is to be executed later.