Discount Item does not Display in the Order Fulfillment Email

Check the settings of the Discount Item used in the transactions.  If Discount Item is set as a non-posting, it will not show on the Order Fulfillment Email.

To check the discount item, perform the following steps below:
     
     1. Navigate to Lists > Accounting > Items.
     
     2. In the Type field at the footer, select Discount.
     
     3. Edit the Discount Item used in the Transaction.
     
     4. Click the Accounting tab.
     
     5. Verify if Non-Posting radio button is selected.