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Error message transferring basic information "The model does not contain the configuration" XYZ "."

I have a managed object context to which I add two different SQLite stores. I use Configurations in an object-bound model of objects to assign specific objects to one store and other objects to another. The configurations are called "UserDB" and "MainDB".

Everything is working fine until I try to use automatic migration. After creating a new version of the managed object model and adding a new attribute to one of the objects in the UserDB configuration, I get an exception when adding the repository of the old version (for the repository associated with UserDB) to the store coordinator: "The model does not contain the 'UserDB' configuration. 'I I can’t find any hits for this error on Google. Anyone out there using several configuration stores? Does anyone have an idea what I can do wrong?

The stack is as follows:

objc_exception_throw
-[NSManagedObjectModel isConfiguration:compatibleWithStoreMetadata:]
-[NSStoreMigrationPolicy sourceModelForStoreAtURL:metadata:error:]
-[NSStoreMigrationPolicy(InternalMethods) _gatherDataAndPerformMigration:]
-[NSPersistentStoreCoordinator addPersistentStoreWithType:configuration:URL:options:error:]
-[MyAppDelegate persistentStoreCoordinator]
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