That’s not what you said in your first post. There, you moved from trash to inbox:
You can’t have replicants of a document in the same group:
Note: Replicants cannot be created in the same location as the originating file, nor can they be made across databases.
(from the documentation)
And please note that there are no folders in DT (unless you’re talking about index Finder folders). DT has groups. Those have no equivalent in the file system, whereas the DT documents do.