Hello,
Lets take for example the weight and height. You have a ranges for them, that means that you can enter from and to values.
The logic allows better precision on selecting the proper rule. If you select and for weight and and for height, the order weight and height must be in the ranges specified in the rates ranges. But if one of the ranges do not cover the order value the rate will be discarded.
Or – at least one of the ranges must cover the order.
and/not – If set for the weight, the order weight must not be in that range, otherwise the rate will be discarded.
or/not – If the weight for example is not in that range, then the rate will be selected.
The idea is that you in some cases may need better control over the logic that is used to select the proper rates. In most cases the “and” setting is what is needed.
Best Regards