The form has one list of all production file destinations, instead of one for each destination type. When you select a destination line, you can change the settings for this line at the bottom of the form.
You can now split the quantity delivered among the destinations when you create a new destination line. To do so, use the new Delivered field. This allows you to correctly calculate the actual costs after receipt. The total quantity delivered against the lines will always remain the same, and is determined by the registration of production receipts.
If you want to change the 'Production' destination, the target production file may not have a 'History' status.