Coupon discount calculated over retailprice not shopprice

We have products on wich we give all our customers standard discount using std VM calculation rules.
When using a coupon discount, the discount is being calculated over the retail price, where I would like it to be calculated over the price after the VM calcutation rule is applied.
How can I accomplish this?
Thanks in advance

Hello,

What math operation are you using for your discount calculation rule?

Type of Arithmetic Operation: Price modifier after tax
Math Operation : -
Value: 0.60

Hello,

Tested this locally. Setup a calculation rule of "Price modifier after tax" with a discount of $15.

I had a 38.83 product, get discounted to 23.83. When I apply a 10% discount, the discount amount is 2.38.