Error 18013

Adjustment amount for item price is a negative value.

This error occurs when the Principal value in an adjustments feed (XML) is a negative value. If you uploaded a tab-delimited adjustments file, this error occurs when the item-price-adj value is a negative value. Principal and item-price-adj must be a positive value representing the refund amount you want applied to the Principal or item-price component of an order.

You cannot charge a customer's credit card by supplying a negative value.

To resolve this error resubmit your adjustment data with a positive Principal or item-price-adj value.