Version 11.3.1 - MacOS App - Core Data - To Many Relationship - Ordered Arrangment - Error Must Not Be Ordered [ 8]

Branching off from the content I learned in Chapter 3: The Core Data Stack, I made a macOS app. One of the entities has a ‘To Many’ relationship. When I check the’Ordered’ box, I immeaditly get the error - ‘EntityName.RelationshipName must not be ordered [8]’
The book does not cover any additional requirements necessary to allow a ‘to many’ relationship to be ordered. Any ideas why I am getting this error?

@cishop Thanks very much for your question!

Is the relationship optional? Does it have an inverse? Just wondering.

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