Error selecting hierarchy node as key figure (Chart)

Hi everybody,

I got an error selecting a key figure as series since our update to Design Studio 1.5.

The key figure is the top level of an hierarchy and displayed as follows:

After selecting this column as series the following error appears:

If I select two columns, everythings works as expected.

We already updated our development system to 1.6 but still get the error.

Is there any SAP Note related to this problem? We couldn't find anything.

Thanks in advance and best regards,

Simon