Export the current pledge TOTAL payment amount now due. Not the pledge balance, not the installment amount. For example: Pledge $500, $100 per year in January, starting in 2013. Missed 2013 and 2014 payments. The current amount due is $200. The current installment due is $100. The pledge balance is $500. I want to get the $200 amount!
Just a work around. If you use Mail > Reminders and choose Create Custom Data file (per pledge) you have the option to pull field called "Running Pledge Balance". We use this in our reminders which we run through mail - didn't realize it wasn't a field in export. You can export your file to excel there and have a list with total amount due even if you don't run the reminders.