Cumulation Function in Bex not working in Design Studio ?

Hi Experts,

I have set Cumulated function for a Keyfigure in Bex .

When i assign this Query to a Crosstab in 1.2, it works fine and the output data is same as in RSRT in BW.

But when i assign it to Chart component, it throws HTML Exception error. Why is it not working for Chart but only for Crosstab? Any ideas?

Thanks & Regards,

Kesavan.