Hi,
you can use the Grouping Feature of Jaspersoft and utilize a variable to summarize the value.
You use the Artikelnummer as Group expression. In the group footer you insert the field Menge - Studio will show a wizard to create a variable. Put all other fields in there to - with no aggregation function. Leave Detail Band empty.
We're a german based consulting company and have a lot of small Jaspersoft customers. If you're interested in more details, feel free to contact me.
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