I have made an entry field required somehow but I’m not sure how. When editing a tag, the tag owner entry field should be able to be empty.

I have set “allow nulls” in the database table:

Does anyone know how I can fix it? To be clear, I want the above form to be submitted without requiring a value for tag_owner.
I found the fix by editing the properties of the .dbml file in the designer view rather than editing in the database explorer. I don’t know why this worked, but it did so I am happy.