Is it you entering the stuff or other people who are going to break it?
The only solution I found to this was a macro which re-applied the conditional formatting each time an edit was made. Not very elegant but seems to be the only option if you can't get people to paste values.
Hey aggi - just seen this, didnt get a notification for some reason. Thought I had got around it by locking only certain parts but having just looked through its all gone to pot anyway! Yes I think it will be easier to just keep everyone else locked out from now on in...
Any way of locking conditional formatting? Data to be received for different projects at different times - trying to protect against copy and pasting