Help for Aimeos

Hi! I'm rather new to Aimeos and I'm having troubles with the following: I'm having only one product in a customers shop. This product has multiple sizes and colors. The customer should get a discount when ordering a certain amount of the product not matter which size or color. So I tried to solve t...

I am getting the Same Error, but only if I try to add more than 12 items to the cart. I am not even kidding.