From the terminology you are using, I am assuming that you are using the Drawing Management Feature (Project Browser/Project Navigator).
Does the View file onto which you are dragging the Construct file have anything else in it prior to the drag? In particular, are there any Constructs already there? If so, do you get the cleanup errors prior to XCLIPping the Construct that you dragged into the View? Clipping an external reference that has Walls beyond the clip boundary (in whole or in part) does not prevent those Walls (or the parts of the Walls) beyond the clip boundary from trying to cleanup with other Walls, including those in other external references (visible or beyond a clip boundary), if your Wall Cleanup Group definition(s) enable Wall cleanup between external reference and host file. Depending upon how the Walls intersect one another, you could just get valid Wall cleanup, which may result in unexpected gaps in visible Walls, or you may get cleanup errors.
If there were no other objects in the View, and if every single Wall shows a cleanup error, double check to make sure you do not have multiple instances of the same Construct located one on top of the other. If Wall cleanup between external reference and host is enabled, every Wall will have a coincidental Walls in the other instance(s) and a cleanup error will result.
David Koch
AutoCAD Architecture and Revit User
Blog | LinkedIn
