Multiple Filters not working - Design Studio

Hello All,

I have seen some of the posts regarding this still no luck making my filter work. here is thh back ground. I have a calculation view created and it has company, Cost Centers, Count, Amt. My requirement is to display company codes and upon slection display appropriate cost centers. I am uning Design Studio 1.2

The calculation view is built on HANA Directly (side cart solution)

Created 2 data sources and 2 drop down (DROPDOWN_BUKRS, DROPDOWN_KOSTL)

       1. DS_BUKRS : BUKRS, KOUNT

       2. DS_KOSTL  : BUKRS, KOSTL, KOUNT  - Background filter - BUKRS

     On Startup - works fine

      DROPDOWN_BUKRS.setItems(DS_BUKRS.getMemberList("BUKRS", MemberPresentation.EXTERNAL_KEY, MemberDisplay.KEY, 10));

     On Selection (DROPDOWN_BUKRS)

      DS_KOSTL.setFilterExt("BUKRS", DROPDOWN_BUKRS.getSelectedValue());   - Applying the selected BUKRS as filter to DS_KOSTL

      DROPDOWN_KOSTL.setItems(DS_KOSTL.getMemberList("KOSTL", MemberPresentation.EXTERNAL_KEY, MemberDisplay.KEY, 1000));

When I select the company code first time it brings up some cost centers (Not Accurate, but brings some cost centers), When I change the company code I get an error 'All selections for dimnesion company codes are invalid and have been discared'

Quetions

1. Dynamic filter thru drop down box (Designedr 1.2) does it work with HANA version 1.0.7

2. how is the back ground filter works , that is defined in the Inial Edit view... (I am treating like a variable we use in BEx and passing teh value throu .setFilterExt)

Any help is appreciated.

Thanks,

Arthur.