1) I don't find a solution until now for my problem in Jasper.
(now I make two new columns in my table (month and year), so I can check
their value directly without any date function).
2) printWhenExpression do not work for me. If anyone could explain how to
work with it... please! thank you.
3) I found a solution. I do not use variables. For group total I use "sum
field X by group" and for grand total I use "sum field X by report". This
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