The requested refund amount for the item price is too high. For help on how to proceed, see http://sellercentral.amazon.co.uk/gp/help/25161
This error occurs when the refund amount you are requesting for a product's item-price or Principal exceeds the amount that can be refunded. The item-price or Principal is the amount the customer paid for a product before shipping and taxes. Common reasons why your requested refund might be too high include the following:
For example, if a customer pays £20 for a product (not including shipping and taxes), you can refund up to £20 toward the item-price or Principal. If you refund £15 of the item-price or Principal, the customer's item-price or Principal balance is £5. Any future refunds for item-price or Principal could not exceed that £5 balance.
To view the current balance for any component in an order, you can search for the order using the Search Orders feature.
To resolve this error, please resubmit your data with a item-price-adj or Principal amount that is less than or equal to the customer's current balance.