Payables Option Automatically Create Freight Distributions Does Not Default Freight Account

We have set up the Payables Option to Automatically Create Freight Distributions and have assigned an account to it. When creating a manual invoice in AP and assigning a freight allocation to the invoice Item line, the freight account is set to the item account, instead of defaulting to the freight account in Payables Options. Is this the expected functionality of the freight option? Is there another setup step or different procedure to follow so that the freight account defaults to the correct one set up in Payables?

Thanks,

Orjola