Why ShipmentTrackingNumber sent in CompleteSale is not returned in GetItemTransaction?

We get a success response to the CompleteSales request as below, but the ShipmentTrackingNumber specified in the request is not reflected in GetItemTransactions for the transaction in question. What is the problem? 

Summary  

 The possible cause of the issue might be: 

• The transaction is not yet checked out ( the buyer has not yet gone through the checkout process to pay the item).
       <CheckoutStatus>CheckoutIncomplete</CheckoutStatus> 

As documented : before you can call CompleteSale, an item that you created as a buyer must have gone through a sale (thus creating a transaction) and pay the item.  Use GetItemTransactions or GetSellerTransactions to retrieve a list of the transactions that have checkedout as: <CheckoutStatus>CheckoutComplete</CheckoutStatus>.

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