Comment 1 for bug 1249398

Code:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1249398-clear-negative-balance-ui-option

This topic branch is a child of:

http://git.mvlcstaff.org/?p=jason/ILS.git;a=shortlog;h=refs/heads/Bill_01-Conditional-Negative-Balances

and assumes this code (and upgrade scripts, etc.) are all applied.
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To test, load a patron with one more more negative-balance transactions, right click on one more of them, and choose "Clear Negative Balance" from the context menu. Selected transactions should disappear from the list once complete (since the balance is now $0) and checking the billing history should show a $0-balance transaction.