Hi y’all,
I new to dynamo and this forum, so please bear with me. 
I’m trying to change the “Material By Original” Y/N Parameter on a wall part, this is what I got:
The funny thing is that it’s actually doing as I tell it to do, even though it says, “operation failed”.
Does anybody know why and how to “fix” this?
Thank you in advance,
Anders Voergaard
Shot in the dark here:
Boolean values are stored in Dynamo differently than Revit. Try feeding a 1 or a 0 for the value and see what you get.
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Hi Jacob,
thanks for your reply.
I read about that somewhere, and I’ve tested it as well, but it doesn’t seem to make any difference.
Any other suggestions? 
Nothing off the top of my head.
Best to post a sample .rvt file which indicates the issue for people to test with. Knowing the versions your in will help too (some things only work in updated software).
Quick update!
I figured out how to get rid of the error, but I’m not quite sure what caused it - I believe it might have something to do with the way Revit handles parts!?
I found that when i sorted my parts there would always be +1 part, let’s say that I split my wall into 15 parts, then my lists would contain 16 parts. Then by running a List.DropItem, on the first part the error would go away.
I also found it funny, that when I searched for the “extra” part in Revit by ID, it wasn’t anywhere to be found, as if it didn’t exist.
I don’t know if you got any take on this @jacob.small , otherwise thanks for your help.