Anybody dealt with trying to do auto-invoicing based on fulfillment? I need a unique key that I can map back from the sales order to item fulfillment. I was thinking about mapping across the “uniquelinekey”, but I cannot find a foolproof way to send these across if there are two lines for the same item.

What I have done is create a custom column field that holds a uuid that gets populated for new line items on sales orders and propagates down the chain as the line items are linked to subsequent transactions.