You cannot add an item of document type "{0}"
to virtual document type folder {1}. The document
type folder supports only document type "{2}".
Document type folders can only contain documents of the document type
that matches the folder name. To create in document type folders,
choose the document type that matches the type folder. Otherwise create
in normal folders and the document will also appear in the type folder
for the document type.
User response
If creating under or copying to a document type folder,
the document type of the item must match the folders document type.