group discount on shipping fee

Hi, i don't know if it's a bug or it's the right section to post this problem. so i've ZC 1.3.8a. i've 3 discount group (25, 35, 45%) and everything seems ok until the checkout when ZC calculates the group discount on shipping also... I tried to solve this problem by myself looking on few ZC support sites but someone said that it depends how ZC calculate taxes applying discount not on the subtotal and then adding shipping but applying the discount to (subtotal + shipping) and then taxes. Note: i cant upgrade to 1.3.9 because i've a template by templatemoster verified for 1.3.8. thank Alessandro

Try this: http://www.zen-cart.com/index.php?main_page=product_contrib_info&cPath=40_61&products_id=333

You should also try getting a new template so you can upgrade. 1.3.8a is nowhere near as smooth, stable, or secure as 1.3.9h. Putting the look of your site ahead of security and functionality is like putting a new coat of paint on a condemned building. The mess might look better from the street, but it's still a mess inside. ;)