Error when grouping certain doors

[Anonymous]

Error message "Can't include Curtain elements in Group". I get this message when I change a non-curtain wall door to demoed in a demolition phase.  Doors in the same family don't cause the same problem in the same group. 

[michael.coviello]

@Anonymous ,   Thank you for posting to the forum.

The problem you are describing seems to only be happening with groups and phases.   Are you demolishing the door while in Group Edit Mode?

Does this article help to describe the conditions you are experiencing?

"Curtain grid based elements cannot be grouped" when editing existing doors in demo phase in Revit

If it does not, can you attach a simple example rvt file which shows the problem to share and a Screencast
video which shows the workflow?