Reporting currency ledger issue when adding Projects

Hello,

   Our EBS instance was upgraded from 1ii to 12.0 many years ago and from 12.0 to 12.1 over a year ago. Now we are adding project costing module plus others and the projects accounting entries are not being created in the Reporting MRC ledger. The options available to us, we are told, is to create a new reporting ledger that would not bring the 11i data as a step was missed during 11i to 12 upgrade to enable 11i eateries be included when creating new reporting ledger.  There are possibly other methods that could be employed that could be supported as well.

   Any idea what other methods that we could use to have project accounting entries create accounting in the current or new reporting currency ledger that would include 11i data?