If you receive the below error message when trying to list to OnBuy please ensure that you have included the following in your listing.

-EAN or OPC (These are mandatory when creating listings to OnBuy)

-Make sure your listing profile has been assigned

-Ensure your category and brand have been selected.

This error will generally occur when either the EAN or OPC is missing, without this information the listing isn't created on OnBuy so when trying to send an update to OnBuy, the error message that this SKU doesn't exist is returned.