Extend Redmin Invoice plugin By patrickn on Sep 5 Max Bid: Open to fair suggestions

We need a way to track what consulting time to charge our clients.  We use Redmine [http://www.redmine.org/] to track our projects, and timesheets.We wish to extend Eric Davis' Invoice plugin for Redmine [http://github.com/edavis10/redmine-invoice-plugin].
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