Display of alternative key in BOBT is empty/space

Hi all,

I created my BO ZLIP_PA with some alternative keys to display node specific information in BOBT:

For each alternative key I defined a structure defining the columns I want to to display. For the ROOT node this structure looks like:

At database level I defined a secondary index. For the ROOT node this index looks like:

In BOBT the alternative can be selected as information to be displayed. For the ROOT node this screen looks like:

After selcting this alternative key the information displayed is empty/space (area marked red) although there are some inforamtion to display (area marked green):

The system status is as follows:

How to display the information of a multi column alternative key?

Regards

Thomas