I've encountered an inconsistency with Revit Schedules and want to know if someone can clarify the behavior.
I have certain parameters I'm using in a Door Schedule that should offer a drop-down list of options. When I click in the schedule cell to make a change, I don't get the drop-down. If I select the same door element in the model (such as in a Floor Plan view), I get the drop-down in the Properties window.
One parameter is a Shared Parameter, which is Instance-Based called "Panel Type", and is the "<Family Type...>" kind of parameter. The other troublesome parameter is a Project Parameter from a Schedule Key (Key Name) for a predefined list of Hardware options. Again, the drop-down box doesn't appear in the schedule cell but does appear in a model view on the Properties window.
Strange enough, if I create a new Door Schedule from scratch and add these same two parameters, the schedule behaves properly and offers the drop-down box.
Any idea why these drop-down boxes might get "locked out" in the schedule? I don't mind re-creating my Schedule once, but I'd prefer to understand what and why Revit is behaving this way to avoid this in the future.
If you activate "Itemize All Instance", is the functionality of the drop-down restored? Maybe there are elements that don't have that pull-down list being lumped into the same schedule line.
Also, as a bug-test, try duplicating the Schedule View and/or setting the Filters to show only elements from the specific Family with that pull-down and see if that works.