$quantity_stored = $this->db->map_unique('item_serial', $item_serial, 'item_quantity', 'item', false);
if(!is_numeric($quantity_stored)) $quantity_stored = 0;
$item_quantity = $quantity_stored - $quantity_removed;
+ if($item_quantity < 0) $this->post_redirect_get("$URL_INTERNAL/1","You don't have enough stored items!");
echo("Stock: ".$quantity_stored."<br />Disposing/Selling: ".$quantity_removed."<br />Keeping: ".$item_quantity);