We are on the nopCommerce version 4.0. The issue we are running into is customer combining cumulative discounts (of different types) and tier pricing.

Customers can effectively apply a product, category, and subtotal discount to their order while achieving the tier pricing levels for a particular product.

Is there any way around this? Can we only allow a single discount per order?
Could we possibly disallow discounts on products that have tier pricing?

Looking for any help on this issue.