title: How to use a calculated data item in a chart in cognos?
body: <p>Currently I'm working in Cognos 10.1 and I'm facing this problem. 
  I've a <strong>data item (date)</strong> and using that I've calculated the <strong>day</strong> of the <strong>date</strong> (i.e sunday, monday...etc). 
  I want to use it in the chart X-axis, to find the total sales on each day. 
  Since it is a calculated data item, it is not displaying the day values in the X-axis.
  Instead, it is blank. How to sort it out? </p>