Hi,
It is mandatory to select atleast one keyfigure from the proivders you need to get the data in multiprovider.
If in case you don't do that then it doesn't participate while displaying the data,
Same is the case in your scenario as you don't have any keyfigure in your dso then you can opt to take default keyfigure of DSO which is 0rowcount.
Do the assignment for it in multiprovider definition.
Drag the same keyfigure in columns in query designer and you can hide the display of it.
Now you will get the data from dso as well.
Hope this helps and resolves your issue.
Regards,
AL