[Sascha]

sa-mp doesn't use "checkpointid" by default..
either use player variables or check for the player's position...

or just use this streamer
https://sampforum.blast.hk/showthread.php?tid=102865
it has checkpointids..
like: new cid = CreateDynamicCP(...........);
public OnPlayerEnterDynamicCP(playerid, checkpoint)

just read the link for more information