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It's known that if sum value could be adde into tree view by adding sum="information_about_sum" in xml. Is it possible to change sum value shown in tree view into a string or another value I want? If it's possible, where I could change?

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adding sum in xml defines operation for grouped records...
you can also use : min, max, avg, count.. (default value is sum) 
More on that subject you can find on zbeans blog post on GROUP operator 

Hope it helps.. 

 

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