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Sum of a Variable


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I have following problem with Jasper Reports and I hope that somebody can help me.

I create a Variable in a supreport and give it back to the main. (Detail Section)

Now, the target is that I can create a summery of this Variable for each Page.

My Problem is that the result is "null".

How can I add this Variable with itselfe?


I hope that my english is good enough, so everbody can understand my problem.


Here is what I had created.



$F{Netto0FW}!= null ? $F{Netto0FW} : 0.0






Thats my result.

$V{varSumTZ} + $V{SumNetto0FW}



Result is always "null".


I don´t know where is my mistake here and hope that somebody can help me.




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