[funkydunk]

just run this patch in admin:

INSERT INTO `xcart_orders` VALUES (
'12345', '', '0.00', '0.00', '', '0.00', '0.00', '', '0.00', '0', '', '0.00', '0.00', '0.00', '0.00', '0.00', 'G', '0', 'Q', '', 'N', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', 'US', ''
);

where 12345 is replaced by the number of your choice.

The next order id produced by the system will be 12346

Once you have had an order you can delete this entry by running the following patch:

DELETE FROM `xcart_order` WHERE orderid = '12345'