Entity Framework 4.0: Error 113: Multiplicity is not valid in Role

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I just had the same message and it was perplexing because the tables I modified in the DB were different from the ones I was getting the message for.

I tried changing the multiplicity 0..1-to-many but the message persisted, even after “Run Custom Tool” commands, cleans and rebuilds.

Resolved by dropping the relationship EF was complaining about and updating the model from DB

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