Error 18008

Invalid MerchantOrderID. For help on how to proceed, see http://sellercentral.amazon.com/gp/help/30681

This error occurs when we are unable to recognize the MerchantOrderID you provided. The MerchantOrderID must exactly match a value you previously provided in an order acknowledgment feed. Common reasons why this error may occur include:

• You accidentally provided the AmazonOrderID instead of your own MerchantOrderID.
• You transposed or omitted characters in your MerchantOrderID.
• Your MerchantOrderID was never created in the Amazon.com system because of an error in a previous order acknowledgement feed.

1. Review the MerchantOrderID field. If the AmazonOrderID is in that field, provide a valid MerchantOrderID. If the field has a typo, correct this.
2. Update your acknowledgment feed with the corrected MerchantOrderID and resubmit your data.