Try to delete rows from sales_flat_order (please note that you should not truncate, but use delete query)

delete from sales_flat_order

It should also delete child rows in related tables (sales_flat_order_item, sales_flat_invoice, etc..)

try it, it should work.

Best regards, Alex

Try to delete rows from sales_flat_order (please note that you should not truncate, but use delete query)

delete from sales_flat_order

It should also delete child rows in related tables (sales_flat_order_item, sales_flat_invoice, etc..)

try it, it should work.