The error is caused by the creation instruction involving a type anchored to a feature argument. Such types are not part of Eiffel standard and are not supported by EiffelStudio except for some legacy code, not involving object creation. The offending feature is "items_from_date_time_interval_average" of the class MEASURE_UNIT_DB_SERVICE. Changing the type of the local variable "l_constraints" to "like {DB_REQUEST}.constraints" solves the issue. We were able to see some other code generation anomalies, and will check if they are critical. Feel free to close the issue if the suggested modification resolves the problem.