alias problem on duplicating documents.

Hello,
I want to duplicate a whole document tree to a new folder, and the problem that I come across is that newly duplicated documents have the same alias as originals. This makes a grate mess, becouse when using friendly urls sometime I’ll get to origninal document and sometime to duplicate.
I know that I can edit alises, but when I have a 100+ documetns, thats lots of work.
Is there any way to solve this problem?
regards,
luke

Not totally sure here, but you might try to disable this option: Allow duplicate aliases

Found in: Tools -> Configuration -> Friendly URLs