Amazon has certain quantity price type limitations for specific products. This error code means that you are using a quantity price discount rate more than Amazon allows for the related item.
Find and update your quantity prices.
To use discount percent price type, your quantity prices need to be “Quantity Price 5> Quantity Price 4 > Quantity Price 3 > and so on…” which is the opposite of fixed quantity price type.
1- Update the quantity prices from lower to greater.
2- Send price updates and sync the channel.