public L2ItemInstance addItem(String process, L2ItemInstance item, L2PcInstance actor, L2Object reference)
    {
		L2ItemInstance olditem = getItemByItemId(item.getItemId());
		
		// If stackable item is found in inventory just add to current quantity
		if (olditem != null && olditem.isStackable())
		{
			olditem.changeCount(process, item.getCount(), actor, reference);
			olditem.setLastChange(L2ItemInstance.MODIFIED);

			// And destroys the item
			ItemTable.getInstance().destroyItem(process, item, actor, reference);
			item.updateDatabase();
			item = olditem;
		}
		// If item hasn't be found in inventory, create new one
		else
		{
			item.setOwnerId(process, getOwnerId(), actor, reference);
			item.setLocation(getBaseLocation());
			item.setLastChange((L2ItemInstance.ADDED));

			// Add item in inventory
			addItem(item);
		}

		// Updates database
		item.updateDatabase();
		refreshWeight();
		return item;
	}