Coupon - Calculating tax wrong

[Davx]

Hi all.

Firstly thanks for taking the time out to read this.

I'm having an issue with the discount coupon / order total module. The discount coupons are working fine, they are deducting the right amount but calculating the wrong tax.

For example this is how it is working at the moment:

Sub-Total:
Order value:£32.25
Postage:£2.75

Discount Coupon:-£10.00

VAT 17.50:£4.04

Total:£28.00


Now the total is correct but the VAT is not. This should be

Order value:£32.25
Postage:£2.75

Discount Coupon:-£10.00
Sub-Total:£23.83

VAT 17.50:£4.17

Total:£28.00

My settings in Order Total > ot_coupon are:

Discount Coupon

This module is installed
true

Sort Order
280

Include Shipping
true

Include Tax
true

Re-calculate Tax
None

Tax Class
--none--

And no files or other modules relating to tax or orders/totals have been modified installed or changed.

I have searched the forums and found people with similar problems but none of the solutions seem to work as they were for an old zc release.

Kind Regards

Dave

[Davx]

Scap this - used Gift Card module instead