SAP Message 5U123 - Flat-rate amount is not within allowed range

Diagnosis
You have entered a flat amount and then also stipulated a minimum andmaximum. The flat amount is outside the minimum and maximum that youhave entered.

System Response
The system cannot save a flat amount that is outside the minimum tomaximum range.

Procedure
Ensure that the flat amount falls between the minimum and maximumamounts by adjusting them accordingly.