How to get data using BEx variable

I've build a universe upon a Bex query with a variable.

When refreshing a WeBi report upon this universe with the filter (BEx variable) it works fine and returns data. The same does the QaaWS.

But when I use this QaaWS as a source for Xcelsius dashbord it doesn't return any data. The input value for the variable is the same in all cases, e.g. K4/2009.

What should be done to fix the issue?