Hi fong,

The image you attached earlier is from the Invoice grid, and it is possible to have multiple invoices associated with the same order. Though I notice that the Order Date is different for both of the invoices on this screen, it is possible to edit an existing order and change the date when posting the second invoice. To assist further, an image of the Order grid and the duplicated order records would help.

I cannot enter a duplicate order number in OE by typing an order number that already exists in either the Current or Historical list of orders. In either case, I correctly get an error that the order number is already on file. So if you indeed have 2 order numbers duplicated in the order list (and the integrity check is clean), then we'd need to know how you get orders into your system. Something funky and unexpected has occurred and know the precise steps is required. I presume they are not imported based on the discussion. Did different people enter the 2 orders?