Comment 12 for bug 1009049

I have modified my above solution for inclusion in work done under contract to MassLNC. The above branches are not the current code. My code is being included in work done on bug 1198465.

You can find some additional details here:

http://www.sigio.com/evergreen/billing2013.html#voidpayment

and here

https://blueprints.launchpad.net/evergreen/+spec/billing-enhancements