Misleading discount amount (group pricing active)

Hey all,

Has anyone else run into somewhat misleading discount calculations when group pricing is active? In my case:

• My store must show prices including VAT (so "My Store" -> "Display Prices with Tax" is TRUE)
• I have only one country with multiple zones and one tax class that applies to all zones
• One group pricing with 10% discount

So, on the checkout page the amounts are:

Sub-Total: 400
Shipping: 0
Group discount: -40
Total: 360

The above is misleading since the 400 sub-total includes VAT - for 24% VAT, the net price is 322.58. So I'd expect to see ~32.26 for group discount, although the totals must include VAT (I didn't make the regulations):

Sub-Total: 400
Shipping: 0
Group discount: **-32.26 **
Total: 360 (this total is actually calculated correctly as it includes VAT)

My settings for the ot_group_pricing module are "Include Shipping"=FALSE and "Include Tax"=FALSE.

Thanks!