Is there anyway to apply a condition when content editor create a field sets in Archetype ? For example, the content editor cannot create a new fieldset which have a same property's value with the old fieldset.

To be specific, my fieldset has a property called name and it get value from a dropdown. When the content editor add a new item (field set) and choose the name from the dropdown list (eg. hello), save it. Then when he create a new item and choose the same name hello, it will alert or prevent this action. That is what I expected. Hope anyone can suggest me some approaches for this situation.