You won't be able to modify downtimes when the CIs are pulled from Views on BSM that don't exist in OMi.
For now OMI does not support synchronization of views from BSM.
In order to get the same views from BSM you can:
- Export the views in RTSM and import them in OMI. - Create the same view in OMI
To get the detailed procedure of exporting the views please refer to the RTSM docs.