Creating Item Fulfillments, and see this error when a transaction has a duplicate sku on multiple lines. Error: “Failed to create, update/transform record because multiple lines found with keys itemkey=XXXX” One method to fix is to not have duplicate lines. Another is to utilize something like a "line", but whenever I try, I receive invalid sublist or line item operation. Is there some sort of magic sauce I am missing in order to use the Line? (I do have that from the original order and it is passed along).