After selecting a ship method and entering an amount, you get the following message.
To assign a price with a ship method, it must be associated with an item. Close the sales order open the ship method list and assign it to an item.
To correct this issue first create an Item with a type of 'Other Charge'.
Go to the Shipping Methods profile list, select the other charge item from the drop down. You can also provide a standard shipping price.
The reason All Orders needs this is because when we record the invoice, QuickBooks requires an item.