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first groupname is empty


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Hi have an xml file like this (this is delivered by an external partner):




next thing is that i build a report about values and the date. then i wanted to group by month and year.

so i build a varible with the following expression (monthYearGroup):

[code]new Integer(new String($F{date}.substring(6,10)+$F{date}.substring(3,5)))

so i get the two groups:

200601 and 200705.

The pdf shows 2 groups but the groupheader (monthYearGroup) shows "null" at the first and then it shows "200601" - "200705" is never shown.

Why does jpR show "null" at the first group?

Did i miss something?

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