That's good that you backdated the pricing model and billing policy because that will throw some problems if you didn't do that.
I am assuming that the TYPE of report you are trying to create is a COST REPORT. I have had the same info message come up when I've ran a cost report saying the "Entity 'whatever' was not present" between whatever dates.
You said you "tried backdating, applying amended billing rates to the entity specifically".
The only way to generate reports on stuff in the past is to go to the Manage Hierarchy tab, then select the Hierarchy you want, then go the bottom of the page where it says Tools and click on the arrow to display the menu. Then at the bottom of the menu you can click on the word Backdate and the hierarchy can then pick up information UP TO 3 MONTHS BACK when running a report.
So the problem might be that you didn't backdate the hierarchy so it can't find into on it in the past.
Another problem if you've done that already is that the time frame you selected the report to generate on is too far back where it can't gather information on it.
So if you did the 3 month backdate but still selected a time frame before that 3 months, then the report will say that the Entity did not exist.
Hope this helps.
As I understand from the above comments. You are trying to generate a COST REPORT for the back dated Custom Hierarchy. When we do a back date on a Hierarchy, Charge Back manager populates the data for all the entities in that Hierarchy for past 3 months from the current date only.
From the above comments, you are trying the generate the report From April 1st 2013 which is too far back. Considering Nov 12 2013 as current date, when we do a back date, Charge Back Manager populates data till Current date - 3 months (appox Aug 12 2013.) which mean on the Hierarchy, we can generate reports where we can give the start as Aug 12 2013. and end date as current date.
This back date feature should be only used for demo purpose and not in real time production envirnoment.