data series property not visible in the chart properties

Hi Experts,

We are using BI 7.0 and I am trying to open the data series property so that i could use a trend line in my bar chart in WAD.

But when i double click on the chart web item, it doesn't open the chart wizard. And it doesn't have the data series property in the properties of the chart item.

I wonder what the problem is.

Any help is appreciated and rewarded with points.

cheers,

Sri