Use
If you delete a rollup, do not delete the rollup ledger that is assigned to it. You should delete only the rollup definition that is used to define how the data is summarized in the rollup ledger.
You should only delete a rollup definition from your productive system if this is absolutely necessary.
Procedure
The Delete Rollup: Initial Screen appears.
A dialog box appears, asking you if you want to delete the rollup.
Result
The system has deletes the rollup definition. You cannot restore a rollup definition after it has been deleted.