Hi taniya,
As far as I understand , you could not load data from DSO to Cube. I suggest you to get into chnage mode of transformation between DSO and Cube and activate it. Do the same for the DTP also.
Run delta DTP and see the data is flowing to Cube or not.
If you see reporting symbol in DSO, which means the data got activated in DSO.
Regards,
Suman