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    <p>I believe I have found the cause and IMO this is a very poor design decision by the Microsoft folks.</p> <p>I went to create a new Foreign Key and set the Primary Key Table and Foreign Key Table and their columns. I then realized that I needed to clean the data in the table before creating the Foreign Key, so I clicked close. What I discovered is that this creates a pending Foreign Key as I described in my question, a FK comprised of the Primary Key fields referencing itself. </p> <p>So what I can reasonably guess has happened is that at some point on these 5 tables, I started to create a FK, thought I had aborted that operation when I hit close, and then made another change to the table, such as adding a field or changing a datatype, and then when I saved the table, I got an unintended FK created. I might add that it was an FK with parameters I had never set.</p> <p>This is a bug in my opinion.</p> <p>Edit: I just discovered that it's actually worse than I described. Even if you hit the cancel button on the Foreign Key creation dialog, it still creates the self-referencing Foreign Key in a pending state. This is terribly stupid.</p> <p>Edit 2: This keeps getting worse the more I investigate. I just got it to save one of these self-referencing FK's by closing SSMS and clicking No on the save changes dialog. I reopened SSMS and the self-referencing FK had been created anyway. Just to recap, I clicked Cancel on the create FK dialog, and No on the save changes dialog, and it created a Foreign Key with parameters I had never set.</p>
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    1. COWhen you first open the dialogue to create a new foreign key, you'll notice the default foreign table is the table on which you're creating the key, and the default columns are the primary key columns of that table!
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