When I try to move an item from the Public Folder it resides in, to another Public Folder, then the item does not move. Instead there is a new Post created in the new Folder which only takes the Subject of the item.
It happens similarly when trying to copy a task item (either by Drag and Drop or by Right hand mouse click menu). There is a new Post that appears in the new Folder, and no item is being copied. I do not want this. I want to move or copy the item.
The new post looks like this:
I tried this, but I get an error message:


I have got "Owner" rights on the working folder. What am I missing?
What setting has to be done that one can drag and drop (move) an item entirely from a Public Folder to another?
Thank you so much.