[AiVAMAN]

pawn Код:

new pickuppickedup[MAX_PLAYERS];
new pickup;

pickup = CreatePickup(bla...bla...bla...);

public OnPlayerPickUpPickup(playerid, pickupid)
{
  if(pickupid == pickup)
  {
    if(pickuppickedup[playerid] == 1)
    {
      SendClientMessage(bla bla bla) // SendClientMessage, that pickup already picked up...        
    }else{
      //Do something here, when pickup is not picked up.
      pickuppickedup[playerid] = 1;
    }
  }
  return 1;
}

public OnPlayerDeath(playerid, killerid, reason)
{
  pickuppickedup[playerid] = 0;
  pickup = CreatePickup(bla...bla...bla);
  return 1;
}

Hope you understand me, an hope this helped...