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.