When applying credits to charges there is a slight issue with keeping track of how much is applied or if you go through the charge knowing the amount of the charge.  It would be helpful when applying through the credit, if it would keep a running total of the credit remaining to be applied.  When applying from the charge it would be helpful if when you get to the next screen where the available credits display, to show the amount of the charge and a running total of the amount of the charge still outstanding