Comment 9 for bug 1206936

I've created a signed-off working branch based on Mike's and Dan's approach, which I've confirmed works on PINES test data. While this doesn't address the consistency issue I brought up in comment #1 above, it does solve the problem reported in the original bug report.

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/csharp/lp1206936_correct_last_billing_info_mtbs