Hi Reiner,
I was able to reproduce this problem using BW with Design Studio 1.3 but it worked properly when I used HANA as a data source. To confirm, I used a string like this:
TEXT_6.setText(DS_2.getDataAsString("QUANTITY_SOLD", {"CATEGORY" : "2 Pocket shirts"}));
which returns a single value (5,822). The same structure (but with UID instead of descriptions) with BW returns an error and no data.
Thanks,
Jim