Error 8020

Invalid StandardProductID. For help fixing this,
see http://sellercentral-europe.amazon.com/gp/help/23901

This error occurs when the StandardProductID value you provide does not meet the requirements for the ProductIDType you specified. Valid ProductIDType values include:

• UPC
• EAN

If you entered "UPC" as your ProductIDType, you must provide a valid 12-digit UPC as your StandardProductID value. If you entered "EAN" as your ProductIDType, you must provide a valid 13-digit UPC as your StandardProductID value.

Common reasons for invalid values include the following:

• You did not provide the required number of digits, because you omitted the check digit. The check digit is the last digit in the string and is calculated based on the other digits in the string. You can verify or calculate your check digit using one of the many UPC or EAN validators available on the Internet.
• The check digit you provided is not valid. The check digit is the last digit in the string and is calculated based on the other digits in your string. You can verify your check digit using one of the many UPC or EAN validators available on the Internet.
• You did not provide the required number of digits because your StandardProductID begins with a zero, and Microsoft Excel removed that zero after you entered it in your Inventory File Template. If this is the case, reformat the StandardProductID column as text (Format > Cells...) before entering your StandardProductID value.
• You specified the wrong ProductIDType. If so, enter the correct ProductIDType.

A good online tool for calculating the check digit for UPC and EAN numbers is maintained by EAN International at http://www.ean-int.org/cdcalcul.html.