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There is a checkbox in the relationship details dialog which shows up after double clicking a relationship in the relationship graph. It says 'create records via this relationship' or so. It makes for example appear a blank line in portals and allows easy creation of related records. FileMaker is so kind to fill the foreign key fields for you, which is only possible when they are writeable.
When you use this checkbox in combination with calc fields as remote keys you will see the message you describe.