Hi Bob

The Drilldown Functionality calls another Report preselected with the Selection Values you can define. It is displayed in the same Preview Window and you are able to switch back to the previous Report. You may try to use the OnStartDrilldownReport Notification, open the desired DF View and return any Value except LL_REPORT_USEDEFAULT or 0. Then the Drilldown is not executed.

Never tried that myself, but maybe it should work.