EGF DRILL_DOWN in Chart Stacked Columns

Hi EGF experts,

I have create an chart with stacked columns.

On X-Axis there storage section with 2 series (number of free and filled bins). I want to click on an column (drill down) and popup a chart with details, but i get no information in the import parameter 'IS_POINTS' which ID (storage section) I have selected, only the index is filled. the an normal column chart works fine.

I use the same method 'ADD_SERIES_GENERAL' in both chart types.

Thank you in advance for your help.