[ShortMessage] => This operation is not allowed for inventory items. [LongMessage] => Inventory-based listing management is not currently supported by this tool. Please refer to the tool used to create this listing. [ErrorCode] => 21919474 [SeverityCode] => Error [ErrorClassification] => RequestError
The request url is https://api.ebay.com/ws/api.dll, and the method is ReviseFixedPriceItem. What does this error mean?