Discounts to extra items

Hi,

We cannot take more than $1000 payment off an individual at a time, some of our courses are over this amount.
For our online bookings this works fine in aXcelerate setting the course cost as the deposit price an the balance payment as an extra item however when we run promotional discounts online with a discount code it is only ever applied to the deposit amount. It would be great if we could add it to the extra items so we do not have to amend every invoice.