[Steven82]

You are doing it wrong obviously. You need to use a variable to detect what the checkpoint is. Then you do something like:

pawn Код:

new NeonCheckpoint[MAX_PLAYERS];

public OnPlayerEnterCheckpoint(playerid)
{
    if(NeonCheckpoint[playerid] == 1)
    {
        GameTextForPlayer(playerid, "Do NOT abuse the neons!", 5000, 1);
        DisablePlayerCheckpoint(playerid);
    }
    return 1;
}

Now your 'SetPlayerCheckpoint' code doesn't need any chaning. But you need t add your new variable underneath it and set it to '1'. Like the example below shows.

pawn Код:

SetPlayerCheckpoint(playerid, 1.0, x, y, z);
NeonCheckpoint[playerid] = 1;

That is one method of doing it. And going to be the easiest to add for your script.