[news.eclipse.birt] how to make sum of percentile = 100

[ezziolai@xxxxxxxxxxxxx (Alessio Lai)]

Hello to all ,
I'm a new Birt user and I'm trying to do a report which display financial 
analysis with a crosstab and a datacube.

There is a column that shows percentiles of a quantity .
I have created a group whith in the total sum is the sum of the 
percentiles.
In many cases the total sum is 100 ,
in a few cases , cause the approximation to two decimal digits , the sum 
is 99.99.
To solve this , I have to add 0.01 to the last percentile row of the group 
,

Do you know how can I do that ??
I guess with javascript for example ...
I wonder if there is a function like

data["percentile"].getLastRow().value ,

so I can adjust the last percentile doing this: 

data["percentile"].getLastRow().value 
=data["percentile"].getLastRow().value+0.01


Hope I well explained the problem .

Many thanks ,

Alessio