For InfoCube:
You can use this program in SE38 for only InfoCubes - CUBE_SAMPLE_CREATE.
For DSO:
You can follow below work around.
1. Create a test infocube with fields same as your DSO.
2. Go to SE38 and execute CUBE_SAMPLE_CREATE.
3. Give test infocube name and number of rows and select the READY-FOR-INPUT-ALV option in input mode and execute.
4. In the next screen, sample data will be shown.
5. Export the output to a spreadsheet.
6. Then you can create a flat file PSA to load the data using this exported spreadsheet.
7. Create transformation and DTP to load data to DSO from this PSA.
