Book-keeping report displays rows inaccurately when contribution amount has been edited

If a contribution has been edited - e.g from 20,000 to 10,000 the book-keeping report now only shows the 20,000 transaction and not the 10,000 or the calculated total.

This is an outcome of
https://issues.civicrm.org/jira/browse/CRM-9066
https://github.com/civicrm/civicrm-core/pull/6490/files

The goal appears to have been to get rid of duplicate rows & to do this grouping by contribution_id + line_item has been added to a report that details financial transactions.

I have reverted the above patch in our repo as the report is a financial transaction report & grouping by contribution-id loses financial transaction info.

However, I haven't looked at the original bug to try to replicate it & determine whether the duplicate rows reported should have been present or not (there should be one row per financial transaction but potentially many for any contribution)