Some item values are inherited by all the instances and subclasses of the item. For example, the value of the "length" property of "credit card" item is the same for all the instances and subclasses of "credit card". Furthermore, there are properties where this is always true (e.g. "has quality" property).
If it could be possible to:

• indicate values that have this property
• automatically fill all children items with the same value (or at least suggest these values when editing/viewing children items)
• track where children items have values different from the inherited values of some parent item

it will save a lot of time and it will make easier to spot exceptions and wrong values.