what about, WAS NOT CHANGED or equivalent?
that will work, but you'll have to structure so that the rule isn't evaluated if Cancel/Close is clicked to not proceed with change..
If Password WAS NOT CHANGED and PasswordChangedFlag = 'Yes' then display Error
'PasswordChangedFlag' attribute is set to Yes when the OK button is clicked.
also, I don't think Aware actually updates an attribute value if the new value is the same as existing.
thus, some kind of 'dirty' flag isn't set for the attribute, and therefore WAS CHANGED isn't satisfied.