Updating data within Taleo on Filled Requisitoins

Summary

Trying to update Org data within Taleo on Filled Requisitoins

Content

We made modifications to our org data within Taleo and we need to update all of our open requisitions along with anything that was filled and canceled during this time period.  We have been told that filled and canceled requisitions can not be updated via a script.  If we were going to make updates, it would have to be done manually by opening the requisition and then filling or canceling it again, which would change the fill/cancel dates from the orignal.  Has anyone had this experience and been able to make such updates?