Does every Core Data Relationship have to have an Inverse?

Let's say I have two Entity classes: SocialApp and SocialAppType In SocialApp I have one Attribute: appURL and one Relationship: type. In SocialAppType I have three Attributes: baseURL, name and favicon. The destination of the SocialApp relationship type is a single record in SocialAppType. As an example, for multiple Flickr accounts, there would be a number of SocialApp records, with each record

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逆参照は必須なの？の質問。双方向参照はApple generaly recommended らしい。CoreData integrityのためとか。しっかり読めていないから読み直した方がいいかも