Hey. I'm developing an inventory system. It works like this. Any eBay seller can connect his eBay account to the system, import listings, create new listings, manage (update, delete) new/existing listings. Besides import function all other functions use eBay's REST api calls. And now I've faced a trouble. It's that after importing existing listings through getMyeBaySelling xml call I cant update them using REST api's (I'm using updateOffer, createOrReplaceInventoryItem for that). So what api's should I use so that I can update existing listings from the system ? If you suggest to first convert existing listing to published offers using bulkMigrateListing api please tell me if there's disadvantage of that way( after migrating could seller update the listing from eBay UI ?). Thanks !