Value Driver Tree drill down - SAC design

[#1]

Hello, 

I've created a simple VDT in an optimized story.

Drill down to customers/sku works well.

However, every attempt to drill up or collapse fails, and I lose the first aggregated design - I'm always getting back to the customers I've selected.

example no1 - collapse from the revenue will just hide/reveal the customers I've selected

example no2: trying to collapse the European customers - it collapses only the European rebates

When is this bug expected to be corrected?

Deb