VAT Calculation after Discount

[mikekiy]

Hi
VM 3.0.16
J 3.5.1
I have a use case where we are using Virtuemart calculation rules to apply category discounts, AWO Coupon to provide various discounts depending on amount of money spent in the cart and the Shopper Group of the user. We are using the VP One Page Plugin to display the cart.  Please reference the attached picture  VAT calcs.png

The 'Product Prices Result' is calculated correctly.
However, after the 'Volume Discount' is calcultaed the 'Total Inc. VAT' is correct but the VAT calculation has not changed.  This miscalculation is carried through to the olrder details given to the customer.

How can i correct this behaviour?

[Jörgen]

Without seeing how the discount rules or the awo coupon discount is set up, impossible to know.
Should probably be an issue for awo coupon or VP if You have done everything right.

regards

Jörgen @ Kreativ Fotografi

[mikekiy]

Jorgen

I have eliminated the VP plugin - if that's turned off then the issue is still there.

I am in conversation with AWO Coupon and will post the result when known.

Mike