Error exporting tracking. 422: Unprocessable Entity: {"errors":{"base":["None of the items are stock

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Our warehouse who logs in with API credentials is getting the 422 error.  They can access orders, but are not able to then send back tracking information.  

I was able to find this in another thread, "The inventory_management field on the variant had been reset to "shopify". I set it back to our app's name, saved the variant and was able to create the fulfillment." I have no idea what it means or where to access this information/settings.

Any help is very much appreciated!