Yes, in such a case, creating a new scenario is the recommended way. OneStream customers create a scenario called "Restatement" or something like that, copy over the relevant data and then post their adjustment journals to this new scenario.
Historical periods that have been closed and approved should not be touched anymore for various legal and audit related reasons. Combined with the way OneStream is designed to facilitate the financial close, by scenario, time and workflow, a separate scenario is typically the chosen way.
This is a consultant's perspective, happy to see if other customers share their experience as well.
