CTBW - how to extract characteristics values for classification node

Hello!

We have 4-level classification hierarchy for materials (KLART = 026). Some characteristic values are maintained at level of material (objects), and some are maintained at level of classification nodes (classes). So childs (materials) of that classes don't inherit that values when I extract data through generated DS (1CL_OMAT001).

How to extract characteristic values for nodes or how to make it inherit parent's values to childs?