This setup applies to all rates settings and Excp/Fixed Discount Codes. If a rate is entered higher than the Max, lower than the Min, or the difference is higher than the Delta, a warning will show. It will not prevent the modification, only warn about the amount.
Path: Management > Rates > Discounts > Setup
Setup the amount in each field: Max, Min, and Delta.
Max: if a rate entered is higher than the max setup, it will trigger the following warning message:
Min: if a rate entered is lower than the minimum setup, it will trigger the following warning message:
Delta: if a new rate entered creates a difference higher than the delta setup with the current rate, it will trigger the following warning message: