If you're shipping through Amazon's Seller Central to obtain "Prime" status, you'll need to configure Finale to properly decrement the inventory.
In your integration screen, click edit configuration next to the "Pull Sales to Finale" line in the Amazon connection (See below).
- Choose "Automatic" to run the task continuously
- Choose the location you want the orders to decrement inventory from
- (optional) Assign the customer to "Amazon FBM Prime". *Note, customer must be created first