JDE Expense Participation: Is there a way to rebill a prior year when prior year expenses are adjus

We have already billed and posted expenses for 2014.  We have received an expense adjustment for 2014 and need to recalculate the lease for that year.  I know that we can remove the billing control flag to regenerate 2014.  My question is how to include the previous billable amount in the calculation?  The Est B/R only points to the regular estimates and not the Act B/R which is were the billable was booked.  The service tax dates on the original estimates and the settlement billing should all be 2014.  When regenerating 2014 with the new expenses, the Est Billed needs