Changed Assigned User from @User_306070 to @anonymous Hi Massimo,no, I'm not working on the properties of the report element itself, but on the properties of a Line Chart graph inside a Multi-axis chart.The Advanced tab in Property Editor call them "expressions", but in the JRXML file these are elements anyway. These are custom properties that I'm using inside a chart customizer class for the Line chart itself (to control and show item labels for each value point).Please, see the attached png.Thera are two properties currently set: if I try to delete one, as soon as the popup is closed the property sheet display "1", but this is only a fake echo; simply change focus to another field and the count switch back to "2". The same thing happens if I try to add a new property.Thank you and regards,S.