function addToBeTransfer($itemtype, $ID)
{
if (!isset($this->needtobe_transfer[$itemtype])) {
$this->needtobe_transfer[$itemtype] = array();
}
// Can't be in both list (in fact, always false)
if (isset($this->noneedtobe_transfer[$itemtype][$ID])) {
unset($this->noneedtobe_transfer[$itemtype][$ID]);
}
$this->needtobe_transfer[$itemtype][$ID] = $ID;
}