Assign maximum order weight for UPS

[tvadpro]

1. A. Starting from an empty cart, add any product from C-20 or C-74 to cart -- for example, a Riviera shed kit.
1. B. Add products from C-65 to cart -- for example, 7 windows.
1. C. Go to checkout and redeem discount coupon.
1. D. Redemption code appears in order total on confirmation page.
1. E. Go to shopping cart and remove all products except C-65 (non-allowed) product(s).
1. F. Go to checkout, pick UPS shipping (only method available) and proceed to payment page.
2. Discount on checkout_payment page remains, e.g. "Redemption code: ZCZCZC : -$5.00"

Also, it just dawned on me that category 65 is a different product type than 20 and 74. The comparison I ran using the other 1.3.7 ZC utilized only one product type, not 2 as in the case of ShedKitStore.com. Could this matter?

There is something a bit strange here ...

When you remove the Product from the cart that allowed the Discount Coupon ...

1 How many Products and what Quantity are in the cart?

2 What does the Discount read in the checkout_payment page?