The Placeholder SKU indicates that Monsoon Marketplace and Alibris are communicating correctly. Monsoon Marketplace sends a purge file to Alibris when you first enable the marketplace. This insures that your account is ready for you to use Monsoon Marketplace to manage your future listings. This process also creates a temporary Placeholder SKU in your Alibris account. Once the purge file has been processed by Alibris, Monsoon Marketplace will send your inventory to Alibris and the Placeholder SKU will be replaced with your actual inventory listings. Note that it may take up to 36 hours for your listings to appear on Alibris.