http://ofbiz.116.s1.nabble.com/jira-Commented-OFBIZ-6212-Accounting-financial-summary-reports-fail-tp4695711.html
Perhaps one thing you can do is identify whether this is a report design issue or environment / something else. If this is simply a faulty report, then I think it is easy to fix. I didn't follow up on all the details but I might be able to help a bit if you can provide contextual information.