Most Trading API calls support a MessageID element in the request and a CorrelationID element in the response. With EndItems, the seller can pass in a different MessageID value for each EndItemRequestContainer container that is used in the request. The CorrelationID value returned under each EndItemResponseContainer container is used to correlate each End Item request container with its corresponding End Item response container. The same MessageID value that you pass into a request will be returned in the CorrelationID field in the response.
If you do not pass in a MessageID value in the request, CorrelationID is not returned.
See the Field Index to learn which calls use CorrelationID.
A list of application-level errors or warnings (if any) that were raised when eBay processed the request.
Application-level errors occur due to problems with business-level data on the client side or on the eBay server side. For example, an error would occur if the request contains an invalid combination of fields, or it is missing a required field, or the value of the field is not recognized. An error could also occur if eBay encountered a problem in our internal business logic while processing the request.