The only fields that are not filled in automatically is the transaction fee and the net amount.  Since all online donations cost the charity the same percentage amount for transactions, it would save a lot of time if we did not have to go into each account and add those two fields manually.  Thus, if one makes a $100 donation, you put in the transaction amount and the net amount - two fields we created in our User defined fields.  You put other data in there so I am not sure why that can't be put in as well