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I wanted to close vote Custom Posts Types as Custom Fields as duplicate of How to make a relationship between books and authors?, but the system says it's not possible.

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I know this is the default behavior and never gave much thought, but recently I voted to close a self-duplicated Question in Stack Overflow and there was no restriction, even if the duplicate Q had no answer.

Why the difference of treatment?

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Not being able to close a duplicate that has no upvotes or accepted answer is the default behavior. The following feature-request was :

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And the exception is outlined in this other post:

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