Posted by visitor82 on May 6, 2011 at 5:31am
Hi
I have spent many hours trying to achieve this without success, so before I invest more I was hoping someone can tell me if its possible !
I have a content type that users fill in to make a selection (it's a cck drop down field).
I want a rule that stops User A from saving the node if user A has already created a node with the same value previously.
I would really appreciate any guidance no matter how brief to put me on the right track.
Cheers.

Comments
Unique field?
There is a module called Unique field (http://drupal.org/project/unique_field) that might do this – it is usually used to limit fields to unique values regardless of user, but it might have some additional settings you can use.
Good luck,
//Johan Falk
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Thanks Johan and thanks
Thanks Johan and thanks especially for the nodeone videos. I have watched them a few times each. I also want to apologise for the guy whose only comment was he had a problem with your noisy keyboard ;-)
Unique Field Should be able
Unique Field Should be able to do this. You can restrict by Author as well as by field.
Yes !
It works as advertised thanks for the help !