Harun
It is normal that you cannot include them, this is by design. They are already included though. So just ignore this flag.
If the tables do not have data, 1. make sure you configure the Data Warehouse in System Options :
2. If the options are checked in, make sure the Baseline slice is covering the expected range in Administration - Timeslices
3. Then run:
Update Report Tables job
Update EV Total Cost
Load Data Warehouse - Full
Load Data Warehouse - Access rights
If after that you do not see the data in DWH_INV_TASK_SUMMARY_FACTS or DWH_INV_ASSIGN_SUMMARY_FACTS please raise a case with CA Support.
Hope this helps -Nika