Filtering Measures required for reporting

Hi All,

I am using SAP DESIGN STUDIO 1.5 and there we have to filter data with measures, now the HANA view which we are hitting is causing a problem, as we have a measure GROSS MARGIN % (GM_PERC) which is actually a calculated column (Gross_margin/Net_sales) .The Calview is basically a Star Join cal view and GM_perc is calculated at the Star join level. Please find the diagram below.

Now when i extend this view i can filter out GM_PERC but It shows me wrong results when i filter it in between Months.I have achieved an alternative with assigning prompts in UNIVERSE, but can I do it in HANA?