Hi Community,
This API warning is indicative that eBay will soon be changing the format in which third party listings services such as Auctiva have to submit combined shipping discount information to them. From what we have seen, listings for which this warning has been returned should still reflect the proper shipping discount information so no corrective action should be required.
Our engineering team is aware of this and we will have the required changes made before eBay flips the switch. Therefore, you can safely ignore these warnings for the time being.
If you submit a listing through Auctiva and find that your shipping discount information does not make it to eBay, please contact our customer support team using the form on the following page of our site:
http://www.auctiva.com/help/-Mike