Percentage caluculation of sales using the from and to qtr prompts from bex query.

Hi Experts  ,

we are getting the data to the Webi report  from  bex query where we are to mandatory Prompts as Financial Qtr (from) and Financial Qtr(To) for the financial Qtr object.

To calculate  the % of sales quarter wise we are  using the formula  as(sales of respective Qtr -Previous Qtr Sales) /Previous Qtr sales.

So to get the Previous Qtr sales we asked BI team when ever user selects the from Qtr prompt  provide the sales values  from the previous Qtr.

ex: From : 2010.3 to 2011.1

then the bex query will provide the sales as

financial Qtr     Sales

2010.2                  100

2010.3                  150

2010.4                   200

2011.1                   250.

with this I am able to calculate the % sales but for one cross table  in the same report

I need to display the sales as qtr wise

So when I Drag n Drop the Financial Qtr, Sales

it wil display the values as

financial Qtr   sales

2010.2              100

2010.3               150

2010.4               200

2011.1                250.

So How to avoid displaying of the previous qtr value of the financial Qtr Dimention for this Table

Please Help Me ....  Urgent.....

Thanks

Regards

Nikil