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You'll probably want to use this "Is Not" operator in this case where you would say: Data Value Changes, Previous Value is Not "0, 0-500" Specifying 0 will distinguish the value from null.
Hi - I work with Alex.
We tried to do that , but the constraint does not allow ranges (0-500) nor multiple numbers 0,1,2,3 for this field.
I still don't get why "is empty" constraint would let 0 values in.