How to exclude null measure values in Chart

Hello Everybody,
I am having a requirement as below.
I have a dimention column ( Month) and a measure column(deviation) in a report.Now the measure column have positive as well as negative values.I have to plot two charts on this same report, where one chart should display the Positive bars, and another only negative bars.
I have actually created two calculated columns as +ve deviation and -ve deviation , as below.
+ve deviation f{x}:
CASE WHEN "fact_table"."Deviation">=0 then "fact_table"."Deviation" END
-ve deviation f{x}:
CASE WHEN "fact_table"."Deviation"<0 then "fact_table"."Deviation" END.
In the chart for displaying only positive bars i am using +ve deviation and vice versa
But in chart i am getting nulls as well in the chart.Is there any other exact solution for this..
An early reply would be appreciated.
Thanks in advance

I have the data in this fashion.see the image in the below link.
http://img13.imageshack.us/img13/5189/deviationreport.jpg
Column Deviation(sec) contains --> +ve as well as -ve values.
in order to plot two charts on this report (one showing +ve values and one showing -ve values) i have created two columns
+ve deviation and -ve deviation.
f{x} of the calculated columns are given above.
Now plz suggest how the is not null filter will work and on what column.

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