Hi, I have exactly the same issue, I've followed all forum posts to the letter and it doesnt work in Studio v 6+. I am literally testing all options within the 2 variables from report to sub-report but always get the same issue. net.sf.jasperreports.engine.JRException: net.sf.jasperreports.engine.JRException: Source variable TimeLogged not found for return value TimeLogged.