Please see Reference Screens for any letter references.
After creating a shipment, you need to check the feed status for the items in that shipment.
If the feed fails, click the ‘Failed’ link to read the error message.
To confirm items have indeed been listed properly, enter the SKU prefix (T) for this shipment, and click Inventory Status (U). If the item status is ‘Inactive (Out of Stock)’, then you can ship this item to Amazon.