We also want a way to do this for your Unique scenario of a parameterizable attribute, but still enable the default assign situation to work. You will see how I tackled this under. @Kent points out that Properties usually are not needed to encapsulate fields, they might do a calculation https://builderfloorinbhiwadi.blogspot.com/2025/05/a-new-chapter-begins-with-jms-low-rise.html