How to fix orders or products with duplicate references?
Order reference numbers and product codes are used to identify orders in myOGO. In order to avoid problems with orders, each one's reference number must be different among your data. The same applies to each of your product's codes, they all need to be different. Normally these references are automatically set with different values based on the integration and there is no overlap.
Same reference numbers
In rare cases, two orders might end up with the same reference number. If two orders have the same reference number, the order that came later will be put to the RESERVED state. Order must be then requested to be moved to DRAFT state from the order's page with "Request to modify order" button. When the order is changed to DRAFT state, the reference number can be changed. Once the order is in COLLECTING or SHIPPED state, the reference can not be changed anymore. See more here how to make edits to an order.
Same product codes
If two products have the same code, there is no way to differentiate them when updating data to the warehouse. Product codes are often automatically fetched from the web store and normally there are no duplicates. If duplicates occur, these fields can be edited manually on the product's edit page.