Shipping tax discount without tax

Joomla 1.5.15
Virtuemart 1.1.14
Using One Page Chechout
Using AWO Coupon Pro

Coupon type: shipping, 100%

When applied, discount is calculated without tax, A example:

Subtotal: 7,20€
Shipping: 5,63€
Payment: 0,00€
Coupon: -4,65 €
Total: 8,18€

Tax is 21%

Hello,

What version of AwoCoupon is this?

Also how is taxes setup in AwoCoupon and in Virtuemart?

Also can you run a test without one page checkout just to verify this is not where the problem comes from.

Hi,

Awocoupon version is 1.5.4

Awo -> Calculate the discount before tax (Coupons) -> No

Virtuemart :

Virtual Tax -> Checked
Tax mode -> Based on customer address
Enable multiple tax rates -> unchecked
subtract payment discount before tax/shipping -> unckecked

Hello,

Still cannot produce it.

Were you able to test without one page checkout on? What was the status?

Also what shipping extension are you using?

Ok, ATM I can't disable OPC, in the next days I will test without OPC and then post the results, the shipping extension is the Standard Shipping Module

Thank you for the fast answer.

Ok, can you tell me what version of OPC you are using? Is this Rupostel OPC?

Hi, after disabling OPC (is Rupostel OPC 1.2.355) the problem persist.

I can trace to see where is calculated the discount, I'm wondering if the correct place to start is /administrator/components/com_awocoupon/helpers/vm_coupon.php

Some clue?

Hello,

Yes, that would be the correct file to look in.

the processing of the coupon code is done in function process_coupon_code_helper.

I will be happy to look at it if you can send a private message with temporary ftp and admin access.