I am also experiencing this problem and cannot find any solution to the problem? We are busy upgrading our client to JasperReports Server 7.9, and some of the parent input controls can have hundreds of options, where at least one child input control has over 10 000 options. Currently this input control can only show 1 300 options, as not all of the parent options are sent along. Only 100 records sent to child input controls.