New Scenario assigned to 0L ledger. How to populate values in FAGLFLEXT...

Hello all,

We went live with SAP about 3 weeks ago, however cost center update scenario was not assigned to the ledger 0L due to some oversight. I have made this assignment just recently so all new postings to cost centers will update FAGLFLEXT with the cost center. However there are about 25000 line items that didnt update FAGLFLEXT with the cost center. What is the best way to handle this? It is not possible for me to reverse out and reenter the lines due to the volume. Any suggestions will be really appreciated.

Thanks,

Saket