When you have Items in Commit which are parallel to items in QuickBooks, you should link between them prior to any import process. This is because linked records are updated while unlinked ones are created as new items in Commit, which may result in duplicate records.
To link a single Item record to the parallel record in QuickBooks, select the relevant Item in Commit and then select the Link Item to QuickBooks … Item from the QuickBooks menu in the Items window.
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