To prevent duplicate value on a Property

Summary:

To prevent duplicate value on a Property

Content (please ensure you mask any confidential information):

I have a property which is configured as a drop down value. There is also a derived logic on the same Property to help system to auto populate this field from the drop down values or user have an option to update it.

Question: How I can make sure the property cannot allow duplicate values. So if Node A has the value for this property as "ABC" and Node B cannot select "ABC" again. It should scan across all nodes and ensure this property has unique values.