Changed Priority from High to None Changed Severity from Major to Trivial Changed Reproducibility from Always to N/A Changed Resolution from Open to No Change Required Changed Assigned User from - to @morlandin Hi,as i've said this section is only for bugs, because here we work on the designer for JasperReports, not on JasperReports. Other than this if the wrong behavior happen on the final report it is probably a JasperReports bug, and not a Jaspersoft Studio, because Jaspersoft Studio allow you to define the layout of the report, but it is filled by JasperReport. In the end you should look for documentation also on JasperReports and iReport. This last one probably has much more documentations since it's an older designer, and every option in iReport is available also in Jaspersoft Studio.For your problem, have you tried to use a variable that sum the value that you are grouping and that has reset time set to group?