Sorting order problem in Query Prompt Selector in Dashboards 4.0

Hi,

I have developed a report in BeX and used posting quarter( 1 2 3 4)...........then using OLAP BeX connection i developed a dashboard.Here, the posting quarter order in prompt selector,displaying as 2 1 3 4.

How can i change the order in prompt selector to be displaying in ascending order ?

Thanks,

Jaya kumar