[SOLVED] Check if a record has siblings on creation

[joebordes]

Now that I see the code I understand better what you are trying to do. I think the "EXISTS" condition could fit your needs. If I remember correctly this condition permits you to know if there exists another record with the same value in a field. In this case, if EXISTS returns true there is another record with that value, if not, the record being saved is unique.

Would that be equivalent to the new condition you added?