I did create calculated item with formula last(db.odbc.select["RADIUSUserDownlink"])/last(db.odbc.select["RADIUSActiveSessions"]). But the formula has a mistake: keys in the formula not contents name of ODBC data source. I received error message: "Cannot evaluate function [last(radius])]: item [RADIUS_WiFi:db.odbc.select["RADIUSUserDownlink",radius] not found". The calculated item became to "Not supported" state.

After correct the formula (now it is: last(db.odbc.select["RADIUSUserDownlink",radius])/last(db.odbc.select["RADIUSActiveSessions",radius])) I tried to change state the item from "Not supported" to "Activated". But I could not do it. The item became "Deactivated'. After second trying to change state it became "Not supported" again. I can't to change state of the item to "Activated". After two days the item still in "Not supported" state.