Considerations for Changing Cube Consolidation Algorithm Type

The recommended approach, for this sort of fundamental change, is typically to create new cubes; if anything, it will avoid accidentally impacting historical data. Onestream doesn't lock at the data level but at the process level (i.e. the Workflow), so a rogue rule could run a Consolidate on the wrong year and mess up your old numbers.

Personally, I wish all calculation-related settings could vary by Time, but that's sadly not the case today.