Detect duplicate entries

catia

Zotero should have a way to match new items to the existing items in the library and detect/prevent duplicate entries. I was just entering items into the library and I was able to enter the same item many times. Since some people may want duplicate entries (for instance in different collections), I would suggest implementing a popup notification, something like this:
This item already exists in your library in the following collection(s):
...
Do you wish to add a duplicate entry?
[OK] [Cancel]

noksagt

Some duplicate detection/handling is planned. See also:
<http://forums.zotero.org/discussion/42/>;

crsdk

everyone's crying for duplicate detection - know there complexities, but simply list possible dupes in new window and let user decide. hurry please.

ZOTERO is fantastic, altho we all need more work is needed. One useful item would be a better user's guide, with search capability.

thx and keep up good work.